The Vintage Wrist Watch Company has dated this piece to the 1920s.
The watch has a stem-winding movement, identified as by Omega, which is working nicely.

In confirmation by Jérôme Jr Monnat, CEO of West End Watch Company, “West End Watch was purchasing watches bearing its brand name from several historical brands such as Longines, Cyma, Tissot, Mido, Omega, IWC, Aubry, etc.”

The movement is protected by an inner hinged cover… there are a couple of scratches to this inner cover.
The watch measures 42mm diameter excluding the winding crown and the loop. The case is silver and there are Continental marks inside both of the case backs for 935 silver. The front and back of the case have engine turned detail. The front of the case is in lovely condition. There is a small indentation to the side of the case and unevenness and rubbing to the hinged case back.

The acrylic lens is in good condition.
The dial is signed West End Watch Co, Sowar, Prima. The name Sowar was registered by the West End Watch Co for watches destined for India and the Far East. The name Prima was added for the shockproof and waterproof models... although, as with any vintage watch, it should be kept away from water. The dial is in its original finish with blued steel original hands. It is in beautiful condition.

The watch comes with a single silver chain, 28cm long including the T-bar and the clasp. Hallmarked for 1915, with a maker’s mark for the Birmingham silversmith William Walter Cashmore. Each of the long links has the silver lion mark. The chain weighs 28g.
The watch and chain come in a new presentation box.
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