N.O.S. winding stem extender 0.9/ 1.0 watch part. Screws on to an 0.90 mm stem, interior diameter 0.90 mm. Threads into a 1.00 mm crown, external diameter 1.00 mm. .

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N.O.S. winding stem extender 0.9/ 1.0 watch part. Screws on to an 0.90 mm stem, interior diameter 0.90 mm. Threads into a 1.00 mm crown, external diameter 1.00 mm. .