Reading pin backstamps
A backstamp is a mark on the reverse of a pin. It may contain words, a logo, a code, or no readable information. Treat it as one piece of evidence, not automatic proof of authenticity, edition size, or release date.
Make the mark readable
- Remove the clasp carefully and photograph the entire back before making a close-up.
- Use soft side lighting and take several angles. Reflections can hide stamped letters.
- Keep the camera steady and focus on the metal surface. Do not enlarge a blurry preview and then transcribe shapes the original does not resolve.
- Keep the untouched photograph beside any enhanced copy, so another collector can check the reading.
Transcribe what you see
Preserve capitalization, punctuation, and line breaks when practical. Mark uncertain characters with a question mark, and distinguish an unreadable mark from a blank back. A printed date on a backing card, a copyright year, and a documented sale date describe different things; none should silently become a verified production year.
Compare with the front
Use the front artwork, physical outline, posts, and packaging to decide whether a backstamp belongs to the same design as another catalog entry. A similar mark can appear on different pins. If the evidence supports a separate variant, describe the visible difference and add photos of both sides.
Open a pin record to upload a readable back photograph for review or suggest a correction. See also comparing similar designs.