Your grandmother's stamp album is still sitting in a box somewhere. Maybe it came with an estate, or you bought a lot at a yard sale without looking closely at what was inside. Most of what's in there is common material, worth a few cents apiece at best. But certain stamps, the kind that look like perfectly ordinary pieces of old paper, have been selling for hundreds to thousands of dollars among serious collectors for decades. Knowing which ones those are requires knowing your way around a catalog, a magnifying glass, and a few things that dealers don't always advertise.
The stamps that get people's attention aren't always the million-dollar rarities you read about in the news. The better opportunity is the mid-market: stamps that serious collectors genuinely want, that do appear in inherited collections and estate sale boxes, and that can be identified without specialized equipment if you know what to look for. This list covers that range, with a handful of grail pieces included so you know what you're passing up if you ever encounter one.
Condition is everything in this market. Stamps with torn perforations, heavy staining, or paper thins are worth a fraction of clean examples. Centering matters: a stamp where the design floats comfortably within wide, even margins is worth considerably more than the same issue squeezed into an asymmetrical frame. Hinge remnants on the back reduce value on unused stamps. So does regumming, which is more common than buyers expect, especially on high-value issues. If a stamp is worth more than a few hundred dollars, have it authenticated before buying or selling.
Table of contents
- 1847 5¢ Benjamin Franklin, red brown (Scott 1)
- 1893 $2 Columbian, brown red (Scott 242)
- 1893 $5 Columbian, black (Scott 245)
- 1898 $1 Trans-Mississippi, black (Scott 292)
- 1898 $2 Trans-Mississippi, orange brown (Scott 293)
- 1901 1¢ Pan-American invert (Scott 294a)
- 1918 24¢ Curtiss Jenny airmail (Scott C3)
- 1918 24¢ Curtiss Jenny inverted (Scott C3a)
- 1930 Graf Zeppelin airmail set (Scott C13-C15)
- 1908-1910 Washington-Franklin flat plate coil stamps (Scott 348-356)
- 1909 Washington-Franklin “bluish paper” varieties (Scott 357-366)
- 1923 $5 Head of Freedom, carmine and blue (Scott 573)
- 1934 National Parks imperforate Farley Special Printings (Scott 756-765)
- 1840 Penny Black, used (four margins)
1847 5¢ Benjamin Franklin, red brown (Scott 1)
This is the beginning of everything: America's first postage stamp, issued on July 1, 1847, featuring an engraved portrait of Benjamin Franklin in red brown on thin bluish paper. It paid the domestic letter rate for distances under 300 miles. The stamps were imperforate, meaning postal clerks cut them by hand from sheets, which is why margin quality varies enormously between examples. Around 3.6 million were printed, and a meaningful number survived, so this is one of those stamps that actually does appear in old collections.
Value depends almost entirely on condition. A used example with four clear, even margins, a light cancel that doesn't obscure the portrait, and no tears or thins brings $700 to $1,500 in very fine grade. Finely centered mint examples are exceptional and command far more. Watch for the 1875 official reproductions, which were produced for collectors from new plates and are listed separately in the Scott catalog (Scott 3). The reproduction has noticeably sharper engraving detail and a slightly different color register. A dealer or the American Philatelic Society's expertizing service can tell them apart definitively.
1893 $2 Columbian, brown red (Scott 242)
One step rarer than the $1. The $2 “Columbus in chains,” depicting Columbus in irons after being accused of administrative misconduct and returned to Spain, had a run of only 45,550 stamps. Like the $1, it had essentially no practical postal use at the time, so examples that weren't given to collectors often ended up destroyed when post offices cleared their inventories at the close of the issue period in 1894.
Used examples in very fine condition bring $700 to $1,200, with wide variation based on centering and cancel quality. Stamps with manuscript pen cancels are fine, but heavy black circular date stamps that obscure the portrait knock value down significantly. These stamps were counterfeited in the late 19th century, so authentication from the Philatelic Foundation or APS expertizing service is worth the investment on any example that looks exceptional.
1893 $5 Columbian, black (Scott 245)
The jewel of the series. Only 27,350 were printed, making the $5 “Portrait of Columbus” among the scarcest of the Columbian issues. The stamp features a medallion portrait of Columbus in stark black engraving, and it is widely considered one of the most beautiful American stamps of the 19th century. The collecting community has treated the dollar-value Columbians as the defining test of a serious US collection for well over a century.
Used examples bring $900 to $1,600 in very fine condition. Mint examples are exceptional and push considerably higher. Centering is critical, as with all Columbians, and paper quality matters too: thins, bends, or creases knock value down hard on a stamp at this price level. The $3 Columbian (Scott 243), depicting the “Fleet of Columbus,” is nearly as scarce with around 27,350 printed and brings similar prices in comparable condition.
1898 $1 Trans-Mississippi, black (Scott 292)
The Trans-Mississippi Exposition stamps of 1898, known as “the Omahas,” are among the most beautifully engraved American stamps ever produced. The $1 denomination, titled “Western Cattle in a Storm,” depicts a scene of cattle battling harsh weather on the Great Plains and is considered by many collectors the most artistically accomplished of all U.S. definitive stamps. Only 56,900 were sold before the Post Office recalled and destroyed the remainder at the close of the issue period.
Well-centered used examples in fine condition bring $275 to $450. Mint examples with original gum push higher. This is a stamp that appears in serious inherited collections with some frequency, since it was designed for collectors from the outset. The most common flaw is a heavy black CDS cancel across the central vignette: light, non-obtrusive cancels preserve more of the value.
1898 $2 Trans-Mississippi, orange brown (Scott 293)
The rarest of the Trans-Mississippi high values. The $2 “Mississippi River Bridge” had a print run of just under 56,000, but the actual number sold is even lower than the $1 because of the even higher price point during an economic downturn. It depicts the Midway rail bridge across the Mississippi, a landmark image from the era of westward expansion.
Used examples in fine to very fine condition bring $600 to $1,000, and mint examples with original gum push considerably above that. The orange-brown color is striking and unmistakable, but watch for cleaned stamps that have had pen cancels removed. A light, even cancel across the bottom margin of this stamp is worth more than one that cuts across the bridge vignette. Authentication is recommended for any example above $300.
1901 1¢ Pan-American invert (Scott 294a)
This is what a real discovery looks like. The 1901 Pan-American Exposition stamps were the first US commemoratives printed in two colors, and the two-color process meant each sheet went through the press twice. On a small number of 1¢ and 2¢ stamps, the second pass went in the wrong direction, producing an upside-down center image: for the 1¢, a lake steamer sailing inverted in its frame. Around 100 examples of the 1¢ invert are known to exist, and they do occasionally surface in old collections from families who didn't realize what they had.
The standard used example brings $10,000 to $20,000 depending on centering and condition, with exceptional examples pushing past $25,000. The 2¢ invert, which shows an inverted Empire Express locomotive, is rarer still, with only about 80 known. These are stamps that require professional authentication before any transaction. The non-inverted regular Pan-American stamps are common and worth only a few dollars, so knowing you're looking at an invert means knowing what the right-side-up version looks like to compare.
1918 24¢ Curtiss Jenny airmail (Scott C3)
The stamp everyone knows is the Inverted Jenny. But the non-inverted version, the regular 24¢ Curtiss Jenny biplane in its correct orientation, is itself a legitimate collector's piece that turns up in old airmail collections with real frequency. It was the first US airmail stamp, issued just days before the inaugural Washington-Philadelphia-New York airmail service in May 1918, and was printed in patriotic red and blue. The plane depicted actually flew the first route, taking off with President Wilson watching, only to immediately fly in the wrong direction and crash.
Mint never-hinged examples in fine condition bring $80 to $150. Used examples are worth less, typically $20 to $50 for a clean cancel. What makes this stamp worth including in any discussion of value is that it anchors the airmail collection: the 6¢ Jenny (C1) and 16¢ Jenny (C2) from the same 1918 series are increasingly collectible in their own right, with mint examples of the C1 starting around $40 to $70.
1918 24¢ Curtiss Jenny inverted (Scott C3a)
The most famous printing error in American stamp history and one of the most valuable objects in US philately. On May 14, 1918, a Washington bank teller named William Robey walked to a post office and purchased the only sheet of 100 stamps ever found with the Curtiss Jenny biplane printed upside down. He hid the sheet under his mattress for a week while postal inspectors tried to recover it. The 100 stamps were eventually split apart, and around 97 remain accounted for.
A single Inverted Jenny in average used condition brings well over $1 million. A single example sold for $2 million in October 2024. It is included here not because you'll find one in a shoebox, but because they do exist in private hands, occasionally in estates that haven't been properly assessed. If you encounter a 1918 24¢ airmail stamp and the plane looks wrong, don't touch it further. Have it evaluated by the Philatelic Foundation before doing anything else.
1930 Graf Zeppelin airmail set (Scott C13-C15)
Three stamps, issued in April 1930 exclusively for mail carried aboard the Graf Zeppelin's transatlantic flights, at face values of 65¢, $1.30, and $2.60. The face values were steep even for collectors, the Great Depression had just begun, and the Post Office destroyed around 93 percent of the print run after pulling the stamps from sale after only about two and a half months. Fewer than 62,000 of the $2.60 blue were ever sold.
A complete set of all three in sound, hinged condition brings $800 to $1,300, with mint never-hinged sets commanding $2,000 and above. These appear in serious old collections surprisingly often, since they were sold specifically to appeal to philatelists. Watch for regummed examples: removing and reapplying gum to make a hinged stamp appear never-hinged is common on Zeppelins because of the price gap. Any set that looks too fresh for its age deserves close scrutiny, and a dealer who specializes in US airmail can tell you what to look for.
1908-1910 Washington-Franklin flat plate coil stamps (Scott 348-356)
This is the hidden-in-plain-sight category of the stamp market. The Washington-Franklin series of 1908-22 produced more than 250 distinct varieties across paper types, perforations, and printing methods, and the flat plate coil stamps of 1908-1910 are among the most valuable of the group. These were strips of stamps designed for vending machines, perforated on only two sides. The key varieties in very fine mint condition bring $100 to $500 each depending on the specific denomination and variety.
The catch is that forgeries made from perforated sheet stamps are common, and they can be nearly impossible to detect without measuring perforations and comparing design sizes precisely. The early coil stamps were perforated on two sides only, while sheet stamps were perforated on all four. A genuine coil with perforations only on the horizontal or vertical edges is the real thing. Buying certified examples from the Philatelic Foundation or PSA for any coil above $100 is money well spent.
1909 Washington-Franklin “bluish paper” varieties (Scott 357-366)
The same Washington-Franklin era produced another category of hidden rarities: the 1909 bluish paper varieties, where the Bureau of Engraving and Printing experimented with a rag-stock paper mix intended to reduce shrinkage. The paper is visibly different from standard wood-pulp issues when stamps are placed side by side with their backs facing up. The experiment failed and production was discontinued quickly, making many of the denominations genuinely scarce.
With the exception of the 1¢ and 2¢, most of the bluish paper varieties are rare, with some costing in the tens of thousands of dollars. The 3¢ through 15¢ are the ones worth examining carefully. The surface-printed color looks slightly different from the standard issue as well, with a subtler tone on the bluish stock. If you have a Washington-Franklin collection and haven't examined the backs of your stamps under good light, now is the time.
1923 $5 Head of Freedom, carmine and blue (Scott 573)
The flagship of the 1922-25 definitive series: the only two-color stamp in the series, printed in carmine and blue, depicting the head of the Statue of Freedom that sits atop the US Capitol dome. Only 1.65 million were produced, far fewer than any other denomination in the series, because $5 in 1923 was equivalent to more than $200 in today's wages. Many were purchased by collectors and sat in albums.
Typical hinged mint examples bring $90 to $180 at catalog value, with mint never-hinged examples and well-centered very fine examples pushing significantly higher. Used examples in fine condition are worth $40 to $75. The two-color printing means the frame and vignette can sometimes shift relative to each other, so look at the alignment: a perfectly registered example is the most desirable. The $2 Capitol (Scott 572) from the same series is a companion piece worth $100 to $175 used.
1934 National Parks imperforate Farley Special Printings (Scott 756-765)
The backstory makes these stamps worth knowing. Postmaster General James Farley routinely pulled sheets of stamps off the press before they were perforated or gummed, then gave them as gifts to Franklin Roosevelt and political friends. When collectors found out, they were furious. The Post Office's solution was to reissue all the affected stamps, including the beloved 1934 National Parks series, without perforations or gum, and make them available to the public in 1935. The reissued imperforate versions are known as “Farley's Follies.”
The imperforate National Parks set (Scott 756-765) brings $30 to $80 for most values in very fine never-hinged condition. They're a step above the standard perforated set in both interest and value, and the story behind them is one of the better anecdotes in American postal history. They show up in serious US collections of the 1930s era with some frequency and are immediately identifiable by the complete absence of perforations. The associated souvenir sheets from the 1934 American Philatelic Society exhibition (Scott 750-751) are more valuable, bringing $25 to $60 each in very fine condition.
1840 Penny Black, used (four margins)
The world's first adhesive postage stamp, issued in Great Britain on May 1, 1840. Around 68 million were printed, and because the British public immediately recognized their historical significance, a substantial number were saved. Many were preserved and used examples remain available on the collectors' market today. This is one of those cases where a stamp's fame doesn't automatically make it rare: common used examples in average condition are genuinely findable, and the price reflects that.
A used Penny Black in average condition, with uneven margins or a heavy cancel, brings as little as £30 to £60. The condition premium is dramatic at the top end: a stamp with four clear, even margins and a light, distinctive Maltese Cross cancel is worth £150 to £400 or more. Cancellation color matters to collectors: red Maltese Cross cancels are the standard, but strikes in blue, magenta, or orange are unusual and command a premium. Stamps on original covers with the Penny Black tied by a cancel are worth more than singles removed from their envelopes.
