0255 Watch Mainspring 1.10 x 0.11 x 267 (10 1/2 ")(Calibers in description)

Dimensions:  1.10 x 0.11 x 267 (10 1/2  ")

End Type: Tongue End

Material: Swiss Made blue steel

Fits Calibers:

ETA 10 1/2 175, Gruen 90, Gruen 91, Gruen 92, Gruen 93, Gruen 98, Gruen 99, Gruen 405, Gruen 405SS, Gruen 406, Gruen 410, Gruen 410SS, Gruen 411, Gruen 411SS, Gruen 420, Gruen 420SS, Gruen 421, Gruen 425, Gruen 425SS, Gruen 426, Gruen 820, Gruen 821, Gruen 835, Gruen 835B, Gruen 881, Gruen 987, Gruen 997, Lip R 136-1, Optima 40