1198 Watch Mainspring 2.00 x 0.20 x 508 (20")(Calibers in description)

Dimensions: 2.00 x 0.20 x 508 (20")

End Type: Tongue End

Material: Swiss Made Unbreakable

Calibers: 

Cortebert 726, Elgin 867, Tissot 43, Unitas 245, Unitas 251, Unitas 261, Unitas 270, Unitas 273, Unitas 279, Unitas 431, Unitas 432, Unitas 435, Unitas 437, Unitas 439, Unitas 445, Unitas 446, Unitas 450, Unitas 451, Unitas 455, Unitas 461, Unitas 473, Unitas 479, Unitas 6431, Unitas 6437, Unitas 6445, Unitas 6461, Wyler WP 70