| | |  | Bead | Home » » » » French Clock Key Jewelers Mainspring Winding Tool Sz 5 | | | | | | | Description: | | New French Clock Key Size 5. This is a new French pattern clock key size 5. This is used to wind French clock mainsprings. It is steel, plated with nickel. The hole measures 3.5 mm. | | | | Customer Reviews: | |
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