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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Cyma 971

Features
stem wind and set
sub second

Data
19''', Dm= 41.8mm
H= 5.35mm
7/15 jewels
f = 18000 A/h
power reserve 42h

Balance staff U252

Stem W255

Mainspring / battery
Zf3423, 1.90 x 17.0 x 0.21 x 490mm

Hands
1.76 x 1.10 / 0.28mm

Comments about the data

Remarks
open-face calibre
Breguet hairspring

family/generations:
old designation / hunter / open face respectively
H= 5.35mm, normal stem mechanism:
19'''B / 914 / 915: just separate cock for escape wheel
19'''2B / 920 / 921: 1 bridge, 2 cocks for train
19'''5B / 950 / 951: 1 bridge for train
19'''7 / 970 / 971: just separate cock for escape wheel
19'''9B / 990 / 991: 1 cock for train, except center wheel
19'''10B / 900 / 901: 1 bridge, 2 cocks for train, excape-wheel cock modified
H= 5.35mm, negative stem mechanism:
19'''1B / 910 / 911: 1 bridge, 2 cocks for train
19'''3B / 930 / 931: 2 cocks for train
940 / 941 (Cyma 19'''4B): 1 bridge for train
19'''6B / 960 / 961: 1 cock for train
H= 6.7mm, negative stem mechanism:
19'''1 / 918 / 919: 1 bridge, 2 cocks for train
19'''3 / 938 / 939: 2 cocks for train
19'''9 / 998 / 999: 1 cock for train, except center wheel
H= 5.0mm, normal stem mechanism:
19'''15 / 954 / 955: 3 cocks for train

Example, year: signature; shock device
ca. 1920: Cyma, Swiss Made - 11412735

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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