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|Gruen 100 (FHF Robert 8.75''')|
8.75''', Dm= 19.4mm, Do= 19.8mm
f = 18000 A/h
power reserve 34h
Mainspring / battery
1.15 x 7.5 x 0.10 x 215mm
1.30 x 0.60mm
Comments about the data
differences not known between 100, 101, 620...623, 626, 627
FHF ran several factories in Fontainemelon, and one was named after the founders Fabrique Robert. The calibres produced there are recorded in few registers (pretty poor and contradictionary) under names like Font Robert, FF Robert, FHF Robert. Bestfit mentions the Gruen 103 as an FHF Robert 8.75''' downsized to 8'''. But the example here (from a Wilka Watch) demonstrates, that this size was available right from factory. Obviously the 8.75''' calibres Gruen 100, 101, 620...623, 626, 627 are also based on this calibre, and are accordingly listed here, but realiable informations can't be given here.
Swiss Patent 51482:
setting mechanism without setting-lever spring
filed 05-03-1910, FHF, Fabrique d'Horlogerie de Fontainemelon (CH)
Example, year: signature; shock device
ca. 1925: - 39, +51482
(FHF Robert 8.75''')
Not for Sale!
The movements presented in this caliber finder are not for sale. This is only a data sheet for identification and evaluation of the movement calibre, as well as for approximate dating.
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