The Vintage Wrist Watch Company has dated this piece to the 1910s.
It is protected by an inner hinged cover.

The watch measures 33.5mm diameter excluding the winding crown and the articulated lugs which are a particularly charming feature of the watch. The case is silver and there are hallmarks inside both of the case backs for London (import mark), 1918 with a sponsor’s mark for Sylvain Dreyfuss.

Fabriques de Montres Rotary was established at 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. Rotary is still owned by the Dreyfuss family today.

Overall the case is in a decent condition for its age, just the odd minor mark and some uneveness / small indentations to the back.
The watch glass has minor marking but is very acceptable.
The white enamel dial has some hairline cracks in the bottom left hand quadrant but not too detrimental to the naked eye.
A new black leather strap has been fitted.
PRICE INCLUDES WORLDWIDE POSTAGE
The Vintage Wrist Watch Company has dated this piece to the 1910s.
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