Longines balance staff 37.9M 39.9M 17.69M

Longines balance staff / axe de balancier

Pour calibres / Same balance staff for following calibers :

37.9M  39.9M  17.69M  ( only for the "M" model of these calibers, not for others 37.9 nor 39.9 nor 17.69 versions )

Height 330

Ronda code 1633

Livraison sous film neutre / Shipping in neutral zip bag