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    • An explanation for the mirror image numerals: http://www.wernersflyingwatches.com/products_ProID_14.html
    • Could be that the contact to signal stem position to the IC is not working.
    • Well,  China mains are 50Hz. Both 50Hz and 60Hz are submultiple of 18,000 bhp (5Hz), but I doubt that can be used to get an idea of rate, and certainly not amplitude, because that pivot is not tied to the balance.
    • It is the 7754 which is the dual time variant and yet the wheel on your movement doesn't correspond with parts for this. [In fact I can't see the wheel in any of the variants looking at https://www.watchmaterial.com/content/eta_7750-7765.pdf ! ). Also a toothed wheel like this should interface with something to move that something otherwise why have this design?! It's not obvious from your photos what that interface might be; unless parts are missing.I'd normally associate a wheel like this as being related to a day indicator though but you don't think it is (?). Which then brings me to the thought that this might be from a model that displays an alternate hour value in a display rather than by a hand - a bit like on the Ulysse Nardin GMT. I don't know enough about specific Breitling models but if you did a google image look through for 'breitling dual time' watches (or similar search phrase) perhaps you might spot something likely.   
    • I should have said that the type I linked is meant for working on small pieces, but certainly not watchmaking or instrument work. E.g. to easily file a flat a on a shaft ⌀12 x 100mm or an hex head that looks good from 50cm. Easily as in, you can talk or think other business while doing it .
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