Dating waltham movements

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Fabrique Horlogerie Fontainemelon (FHF) was a large manufacturer of Swiss ébauches who did this a lot.To see a clear example of this look at the section below about Eterna movements customised for Stauffer & Co.The really definitive "fingerprint" of a movement is the keyless work, which is why materials parts suppliers such as Bestfit and Schwartchild often show only the components of the keyless work in their movement identifications.However, to see the keyless work requires the dial to be removed, which may not be possible, and many older movements are not documented in these references.The fingerprints in the Bestfit book can be used to easily identify these movements.

220 Mystery movement 3 It is a small selection of often unidentified old movements that I have been able to positively identify.I don't mind you using these for your own personal research, but if you want to use them elsewhere such as on an internet forum, a web site, or in a publication, please read my copyright notice first and include attribution.If you have any questions or comments, please don't hesitate to contact me via my Contact Me page.By looking at trademarks on plates, apparently different movements with the same keyless work, and other sleuthing, some progress has been made. The image here from the "Official Catalogue of Swiss Watch Repair Parts" issued by the Watchmakers of Switzerland in 1948 shows how movements are measured for diameter D, which is the dimension that matters.Note that the diameter D is taken from the part of the movement immediately below the widest part of the bottom plate.

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