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7.75 x 11.75''', Dm= 17.65 x 26.4mm
f = 18000 A/h
power reserve 40h
Balance staff U2415
Mainspring / battery
1.18 x 8.5 x 0.105 x 250mm
~Zf665, 1.20 x 8.5 x 0.095 x 265mm
1.22 x 0.66 / 0.16mm
Comments about the data
to wide extent like 500, but optimized for curved models
Conoruma is Gruen's proprietary alloy for hairspring and balance with low temperature dependence
311: Curvex, curved back surface
355: flat dial surface, plane back surface
355C: curved dial surfce, plane back surface
Example, year: signature; shock device
1937: 328811, 500, Gruen Watch Co, Switzerland, Coronuma Hrsp. & Bal., 15 Jewels
(Gruen 501 signed as 500)
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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