P440 30-hour MS (3/8 x .014 x 48
P441 30-hour MS (5/16 x .015 x 42
P331 31-day Mainspring
P1496 8-Day M.S.C.G. 3/4"x.0165x96"
P1458 8-Day M.S.C.G. 3/4"x.018x96"
MS259 Mainspring
MS280 Mainspring (80-155)
MS301 Mainspring (80-170)
MS257 Mainspring (80-186)
MS287 Mainspring (80-195)
MS302 Mainspring (80-230)
MS255 Mainspring (80-365)
MS285 Mainspring (80-435)
MS262 Mainspring (80-446)
MS290 Mainspring (80-451)
MS300 Mainspring (80-480)
MS296 Mainspring (80-485)
MS264 Mainspring (80-493)
MS260 Mainspring (80-501)
MS270 Mainspring (80-502)
MS253 Mainspring (80-504)
MS261 Mainspring (80-505)
MS274 Mainspring (80-506)
MS284 Mainspring (80-507)
MS289 Mainspring (80-508)
MS292 Mainspring (80-509)
MS293 Mainspring (80-510)
MS295 Mainspring (80-511)
MS297 Mainspring (80-512)
MS299 Mainspring (80-513)