For calibres 8 3/4''' to 19'''. Tightening on ∅ external from 30 to 48 mm.
Bergeron's swiss made movement holder is reversable and wil fit a wide range of watch movement size allowing you to hold from 20 mm (8 ¾ ligne) to 43 mm (19 ligne) in size. Chromium-plated and sanded.
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