Cortebert mainspring 571 575 577 583 661 663 673 + Moeris 10"'1/2 C , 10"'1/2 D , 10"'1/2 CD

1 mainspring Cortebert 571 / Ressort de barillet / Zugfeder

New old stock / neuf de stock

Same mainspring for all Cortebert following calibers : 571 575 577 583 661 663 673

Also for Helvetia 80 80C 81 81C 82 82C 800 800C 820 820C and

Moeris mainspring 10"'1/2 C , 10"'1/2 D , 10"'1/2 CD