Rolex balance staff H NC 500 510 520 530 (ht.298 - hspg 40) / Ronda 3601

1 Rolex balance staff / 1 axe de balancier Rolex

Neuf de stock / New old stock

Size 8"'3/4 (not for models H , NC size 10"'1/2)

Same balance staff for all following calibers : H , NC , 500 , 510 , 520 , 530 (only models with hairspring collet 40)

Dimensions : height 298 / half-height 155 / balance arbor 80 / roller 37 / hairspring collet 40

Ronda code 3601