Originally Posted by Dimman Could also be a 'New' (for the time) FHF 98: https://perrinwatchparts.com/collect...28929703215138 Same bridge pattern, but thinner (3.6mm) and higher beat rate (21600). Edit: Have you found this in your search? https://www.watchrepairtalk.com/topi...n-walkthrough/ Edit 2: Also this: I would have thought 96 as that what I thought I saw under the hair spring looked like 96 then in a cloud with either fhf or eta ? or be interesting to see a close up of the hair spring
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