Mainspring for wrist watches with manual winding.
Suitable for the following calibres:
AS 1000, AS 1001, AS 1023, AS 1030, AS 1119, AS 1334, AS 1373, AS 577.301, BEN AF, BUL 1600.10, BUL 7AD, BUL 7ADC, BUL 7AM, BUL 7AMC, BUL 7AS, BUL 7BS, BUL 7BSC, BUL 7BU, BUL 7BUC, BUL 7WM, BUL 7WMC, BUL 7WS, BUL 7WSC, ETA 277.001, GP 66 OLD, GP 68, GP 88, GP 88U, HAM 772, KF 17-10, KF 17-11, KF 350, KF 351, PUL Y431A, PUW 1177, ROL 1001, SEK 1100A, SEK 1140A, SEK 11A, TIS 3000, WIT 1373, WIT 6M7, WIT 6N7, WIT 6N7G, WIT 6W7
