Maker

Item #

Size

Description

In Stock

Price

Buy

South
Bend

JA600

18/S

18s Mainspring Factory # 19528
width in mm 2.95, strength in mm 0.195
length inches 21-1/2, end T
Models 309-312-313-337-340-341
342-343-344-345-346-347

Yes

$39.00

South
Bend

JA602

16/S

16s Mainspring Factory # 27528
width in mm 2.8, strength in mm 0.19
length inches 21-3/4, end T
Models 203-204-207-292-293
294-295-298-299

Yes

$39.00

South
Bend

JA603

12/S

12s Mainspring factory # 55528
width in mm 1.98, strength in mm 0.175
length inches 19, end T
Models 407-411-415-417-419
429-431

Yes

$39.00