0509 Watch Mainspring 1.30 x 0.085 x 254 (10) (Calibers in description)

Dimensions:  1.30 x 0.085 x 254 (10)

End Type: Tongue End

Material: Seiko part number 401-039

Calibers: 

Bifora 81
Court S
Election 435
FHF 46-6 ligne
Kurtz 12-121
MSR K1
Revue 78, 78SC
Roseba 65
Seiko 80A (8000)
Vulcain K1, KL