The Vintage Wrist Watch Company has dated this piece to the 1930s.
The watch has a Swiss 15-jewel hand-winding movement which is working nicely. The movement is signed with the Rotary wings logo.
The watch measures 30mm wide excluding the winding crown and 30mm high excluding the lugs.

Rotary Watches Ltd was established in La Chaux-de-Fonds, Switzerland, by Moise Dreyfuss in 1895. By the 1920s family members Georges and Sylvain Dreyfuss began importing Rotary watches to Britain, which was to become the company's most successful market.

The case is in good condition for such an early piece, just minor marking but nothing serious at all.
A later replacement crown.
The lens has a couple of small marks but you have to look closely to see them.

The dial has a faint hairline running from the centre up towards number 10, but difficult to see with the naked eye.
A new leather strap has been fitted.
The watch comes in a stylish vintage Rotary presentation box.
The Vintage Wrist Watch Company has dated this piece to the 1930s.
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