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Fig. 1

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Fig. 2

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Fig. 3

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Fig. 4

FHF Robert 8.75'''

manual wind
sub second

8.75''', Dm= 19.4mm, Do= 19.8mm
H= 3.3mm
F= 0.4mm
T= 1.5mm
15 jewels
f = 18000 A/h
power reserve 34h

Mainspring / battery
1.15 x 7.5 x 0.10 x 215mm

1.30 x 0.60 x 0.20mm
1.10 x 0.60 x 0.20mm

Comments about the data

different bridge shaoes (cf. photos)
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:
filed 05-03-1910, FHF, Fabrique d'Horlogerie de Fontainemelon (CH)
setting mechanism without setting-lever spring

Example, year: signature; shock device
1-2) ca. 1920: - 39, +51482
2-3) ca. 1925: Swiss Made - +51482

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.

bidfun-db 21.3 © 02-08-15, mtr-Ranfft

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