The most famous stamps in the world are mistakes. Errors and varieties — stamps that left the press different from how they were meant to — are where philately’s biggest prices and best stories live. Here is what counts as an error, the main types to know, and how to think about what they are worth.
Part of our Stamp Collecting Guide. This is a deep dive on one topic from our complete resource for collectors. Read the full Stamp Collecting Guide →
Errors vs. varieties
An error is a genuine production mistake: an inverted center, a missing color, a stamp that escaped perforating. A variety is a smaller, often systematic difference — a watermark change, a different perforation gauge, a re-engraved plate. Both attract specialists, but dramatic errors tend to command the headline prices.
The classic error types
- Inverts — part of the design printed upside down (the Inverted Jenny is the famous example).
- Missing colors — one ink color omitted in printing.
- Imperforates — stamps issued or escaped without perforations between them.
- Color shifts and double prints — misregistered or doubled impressions.
- Watermark and perforation varieties — subtler differences prized by specialists.
What makes them valuable
Scarcity drives it: errors are, by definition, the ones that weren’t supposed to exist, so few survive. Add condition and demand, and a single error can be worth many multiples of the normal stamp. But not every oddity is a valuable error — some are common varieties, and some “errors” are simply damage or fakes.
The caution: errors are faked
Because errors carry premiums, they are among the most faked items in the hobby — fake imperforates trimmed from normal stamps, altered colors, and forged overprints. This is exactly where independent expertization matters most: a certificate from a recognized body is the standard of proof for any valuable error.
How to handle a possible find
If you think you have found an error — especially in an inherited collection — don’t alter it, don’t trim it, and don’t assume. Identify the normal stamp first, compare carefully, and get an expert opinion before treating it as valuable. Most surprises turn out to be common varieties, but the occasional real find makes the careful look worth it.
Catalog the details
Errors and varieties are defined by precise details — which color is missing, which perforation gauge, which printing. Relicara keeps a per-stamp record with photos and notes, so the specifics that make a stamp special stay documented. Sorting an inherited lot? Start with how to value an inherited collection; for condition basics, see MNH vs. hinged.
