How Much Is an Inverted Jenny Stamp Worth?
Identify the Original Error First
The original Inverted Jenny is the 1918 24-cent U.S. airmail error, Scott C3a, with a blue Curtiss JN-4-H airplane printed upside down inside a carmine frame. Only one error sheet of 100 was sold. Position numbers, straight edges, perforations, gum, repairs, and a recognized expert certificate are central to identification. Later reproductions, tribute issues, prints, and altered normal stamps are not the 1918 error.
A Verifiable Sale Example
The Smithsonian National Postal Museum records that one original Inverted Jenny sold at auction in 2018 for $1,593,000. That figure is a historical result for a particular certified example and sale; it is not a price guarantee for another stamp. A block, single, position, condition, provenance, and market date can produce very different results.
Evidence Needed for an Estimate
- Clear front and back images at high resolution
- Exact dimensions, perforations, edges, gum, hinge status, and faults
- Sheet position or provenance documentation, where available
- A current certificate from a recognized expertizing body
- Completed sales for the same type and comparable condition
Do not remove hinges, clean, regum, reperforate, or otherwise alter a suspected example.
Prices for current mailing-stamp options apply only to everyday postage and do not establish an Inverted Jenny's value. Valuation evidence must match the version, certificate, condition, provenance, and sale terms.
Sources and Scope
- Smithsonian National Postal Museum: 24c Curtiss Jenny invert single, Scott C3a.
- Smithsonian National Postal Museum overview, including the recorded 2018 auction result.
- Smithsonian: 1918 Inverted Jenny history.
This is an identification and market-evidence guide, not an appraisal of an unseen item.