This Bergeon movement holder is incredibly versatile because it is reversible. It allows you to hold large watch movements from 20 mm (8 ligne) to 43 mm (19 ligne) in size. It is considered to be a classic by watchmakers. It is nickel plated and sanded to remove all rough edges to protect the watch movement.
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Bergeon
Bergeon 4040 Extensible and Reversible Watch Movement Holder
Bergeon 4040 extensible and reversible movement holder –