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.

The watch measures 50mm diameter excluding the winding stem and the loop. The case is silver and there are Swiss hallmarks inside both of the case backs together with the early Omega logo. The case has a couple of small bruises to the side and some unevenness to the hinged case back.

The watch glass has light marking but is very acceptable.
The dial is signed Omega, importé de Suisse. There is a faint hairline between 11 and 12, and a patch of hairlines on the edge of the dial by number 5.
The watch comes 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