Preliminary identification
Photo reference
1 uploaded photo
Overview
A vibrant 10-cent commemorative stamp issued to celebrate the Mariner 10 mission, the first spacecraft to use a gravitational assist to reach another planet. It features a detailed illustration of the probe against the backdrop of Venus and Mercury.
Story
Launched in 1973, Mariner 10 was a cosmic 'slingshot' pioneer. This stamp was released in April 1974, just as the probe was beaming back the first-ever close-up photos of Mercury's cratered surface.
Maker / Origin
The Bureau of Engraving and Printing produced this using the photogravure process, a technique that allowed for the rich, layered colors seen in the planetary shadows. The design was intended to inspire a generation of Americans during the height of the Space Race's scientific expansion.
Condition & Value
The stamp appears to be in 'used' or 'hinged' condition based on the mounting. There is some visible surface dirt on the surrounding paper, but the stamp's colors remain bright. Common condition issues like these keep the value at the lower end. This is a very common commemorative stamp with millions printed.
Full Research
Sold comps, value drivers, and venue guidance pulled from recent auction results.
Build on this identification
Layer in sold comps, value drivers, and venue guidance.
Comparable demand stays strongest where maker, originality, and venue confidence line up. Broader examples still trade, but the range tightens quickly when provenance, condition, or selling lane fit is missing.
Best Venue
Specialty auction or a focused dealer with buyers already in this lane.
Signed example with light edge wear and original frame.
Comparable format with stronger provenance and cleaner surface.
Smaller related piece with visible craquelure and trimmed margins.
Period match with softer condition and weaker subject matter.
Close market lane comp with similar material and presentation.