Mainspring for wrist watches with manual winding.
Suitable for the following calibres:
BEN GW1B, BEN GZ3B, BLF 6G1B, BLF 6G3B7-6G3B8, BLF 6H1B8, BLF 6K3B8, BLF 6K4B81, BLF 6L1B8, BLM BI-6-H, BLM BI-6S-H, BUL 1561.10, ELG 935, ETA 2660, ETA 2661, ETA 2668, FF 138.001, FF 138.011, FF 138.311, HAM 889, INT 380.001, INT 380.011, JUB W101, JUD 380.001, JUD 380.011, MAS 110, MAS 114, QUA 6G1B, QUA 6L1B8, SEK 2102A, SEK 2102B, SEK 2102C, SEK 2104A, SEK 2104B, SEK 2107A, SEK 2117A, SEK 2118A, SEK 2119B, SEK 2140A, SEK 2160A, SEK 21A, SEK 21B, SEK 21C, SEK 21D, SEK 21E, SEK 21F, SEK A601, SEK A602, SEK CHORUS, SEK QUEEN, SEK SPORTSLADY, STA 403, TIS 2351, TIS 2361, TIS 3071, UTC 231, UTC 231A, UTC 28, UTC 28A, UTC 28CS, UTC 28S, WCX A631, WCX B601, WCX B602, WCX B611, WCX D607, WIT 101, WIT 422, WIT 8V1
