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 Fig. 1  Fig. 2 | Cyma 17'''18 open-face Features stem wind and set sub second Data 17''', Dm= 37.8mm H= 3.85mm 15 jewels f = 18000 A/h power reserve 32h Balance staff U1702 Stem W1448 Mainspring / battery Zf2933, 1.40 x 15.0 x 0.19 x 430mm Hands 1.75 x 1.10 / 0.22mm Comments about the data | Remarks open face calibre Breguet hairspring family/generations: hunter / open face (old designation) respectively H= 3.85mm: 704,706 / 705,707 (17'''30): 3 train cocks 784,786 / 785,787 (17'''18): 1 train cock 796 / 797: bigger barrel H= 5.05mm: 764,766 / 765,767 (17'''6): 3 train cocks 768 / 769: 3 train cocks, negative stem mechanism 734,774 / 735,775 (17'''7): 2 train cocks 736,776 / 737,777 (17'''7): 1 train cock 778 / 779: 1 train cock, negative stem mechanism Example, year: signature; shock device ca. 1930: 227028, Cyma**, Ref. 777, Patented, Adjusted, 15 Jewels (Cyma 777, H= 5.05mm) 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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