The Vintage Wrist Watch Company has dated this piece to the 1920s.
Rotary Watches Ltd was established at La Chaux-de-Fonds, Switzerland, by Moise Dreyfuss in 1895.

This particular watch has a Swiss 15-jewel hand-winding movement which is working nicely. The movement is signed with the Rotary wings logo.
The watch itself measures 25.5mm wide excluding the winding crown and 30.5mm high excluding the lugs. The case is Glasgow 1929 with an importer’s mark for Sylvain Dreyfuss. The case has some unevenness to the back and the odd minor mark but overall all very acceptable for a 1920s piece.

The convex lens is in good condition.
The dial is in its original finish which has darkened with age but still easy to read. Blued steel hands, a subsidiary seconds dial and an inner minute track.
The watch has a new black leather strap.
The watch will be sent in a new presentation box.
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The Vintage Wrist Watch Company has dated this piece to the 1920s.
Specialists in antique and vintage wrist watches and pocket watches
You can view the stock and full dealer information on the The Vintage Wrist Watch Company Profile Page