ETA mainspring 1070 1071 1072 1170 1171 1172 + Movado 579 + MST 325 342 429

1 mainspring / Ressort de barillet / Zugfeder

New old stock / neuf de stock

Same mainspring for following calibers :

Movado 579

MST 325 and 342 and 429

ETA 1070 1071 1072 1170 1171 1172

Only for manual wind movement, not for automatic movement