Vintage Blue Steel Watch Mainsprings Width 1.25 MM

Blue Steel Mainspring Width 1.25 MM, Dennison 3 1/2
~~$4.00~~ $2.00 On Sale!
BLMS-3514105
Metric Width: 1.25 mm, Dennison Width: 3 1/2
Metric Strength: 0.07 mm, Dennison Strength: 14
Length in Inches: 10 1/2

Blue Steel Mainspring 1.25 MM, Dennison 3 1/2
~~$4.00~~ $2.00 On Sale!
BLMS-3511115
Metric Width: 1.25 mm, Dennison Width: 3 1/2
Metric Strength: 0.10 mm, Dennison Strength: 11
Length in Inches: 11 1/2

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