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9 x 12.5''', Dm= 20.0 x 28.0mm
Do= 20.6 x 28.0mm
f = 18000 A/h
power reserve 36h
Balance staff U758
Mainspring / battery
Zf704, 1.20 x 12.0 x 0.13 x 390mm
1.45 x 0.81 / 0.20mm
Comments about the data
pattern for the space-efficiancy movement Urofa 58
indirect sub second
shock protection by elastic pivots (Bild 3):
Top: The steady transition from the pivot to the rather thin end of the staff inhibits beaking at this spot.
Bottom: On a conventional staff the sudden transition from the pivot to the thick arbor end enhances the danger of breaking at this spot.
Example, year: signature; shock device
ca. 1940: Revue, G.T, 54 - GT (Gédéon Thommen); Revue-Thommen
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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