Mainspring for wrist watches with manual winding.
Suitable for the following calibres:
Grün: 770R, 910SS Longines: 241 Valjoux: 7730 Venus: 150, 152, 175, 178, 179, 183, 184, 185, 186, 187, 188, 189, 190, 191, 200, 205, 206, 207
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