Maker

Item #

Size

Description

In Stock

Price

Buy

Hamilton

HOW201

18s

18s Mainspring Factory # 15/718013
width in mm 2.80, strength in mm 0.205
length inches 21-1/4, end hole
Old Model

Yes

$25.00

Hamilton

HOW202

16s

16s Mainspring Factory # 328
width in mm .270, strength in mm 0.017
length inches 21 1/2, end hole
New Model

Yes

$25.00

Hamilton

HOW203

12s

12s Mainspring Factory #552
width in mm 0.190, strength in mm 0.16
length inches 19, end hole
New Model

Yes

$25.00

Hamilton

HOW204

12s

12s Mainspring Factory #553
width in mm 0.190, strength in mm 0.16
length inches 19, end hole
New Model

Yes

$25.00

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