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 (only models with hairspring collet 40)
Dimensions : height 298 / half-height 155 / balance arbor 80 / roller 37 / hairspring collet 40
Ronda code 3601