Support Us

Help Keep Ranfft DB Running

Ranfft DB is a free, public caliber database maintained by a small team. Server costs, image storage, and development time all require ongoing funding.

Advanced Search

Experimental filters and advanced search features.

Full Gallery

Unrestricted access to the full image gallery.

Parts Tools

Advanced search tools for replacement and interchange parts.

Keep It Growing

Help maintain and grow the largest public watch caliber database.

What your support unlocks

The tools that actually save you time at the bench:

  • Find a donor movement
    When a part is no longer made, this ranks every other caliber by how many of your parts it can supply, and flags the ones built on the same base movement. Instead of guessing, you go straight to a donor you can harvest — or to a part that interchanges.
  • See the parts you can still buy
    For any caliber, the spare parts that fit, grouped by type — mainspring, balance, barrel and so on. Discontinued references point to their current replacement, and each part shows every caliber it fits plus its factory equivalents.
  • Identify an unmarked movement
    When the caliber number is worn away, narrow it down with extra filters built from physical details you can read off the movement: import code, balance support, hairspring stud and stem release.
Pricing

$5 / month — cancel any time

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