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New 5 Sided Bergeon Clock Key

This is a new 5 sided Bergeon clock key. This is used to watch clock mainsprings.

The sizes are:

• Size 0, 2.25 mm
• Size 4, 3.25 mm
• Size 6, 3.75 mm
• Size 8, 4.25 mm
• Size 11, 5 mm