1023 Watch Mainspring 1.65 x 0.10 x 305 (12")(Calibers in description)

Dimensions: 1.65 x 0.10 x 305 (12")

End Type: Tongue End

Material: Swiss Made Blue Steel

Calibers: 

AHS 40, AHS 41, AHS 42, AHS 43, AHS 70, AHS 72, AS 856, Bulla 46, Buren 410, Buren 411, Cortebert 661, Cortebert 663, Ebosa 510, Femga 500, Femga 502, Helbros 83, Helbros 107, Junghans 80, Junghans 80/3, HS 236, Urofa 55, Urofa 551, Westfield 10WZ, Winton 5, Witnon 11, Winton 14, Winton 16, Winton 16-5, Winton 16-8, Winton 28, Winton 28-8, Winton 32, Winton 32-8, Winton 142, Winton 142-17