The bench

Tools for reading a Seiko

Small, precise utilities for collectors. Everything runs in your browser — nothing you type leaves the page.

Decode the production month & year from any Seiko caseback serial, with caliber-based decade narrowing.

Search Seiko movements by number — type, jewels, production window and notes.

Decode a pre-1966 five-digit case code — ligne dial size, family, and the model for known codes.

Narrow down a model from its dial, case and bracelet characteristics.

Look up lug width by reference and get strap-style recommendations.

Estimate remaining quartz battery life and set a change reminder.