The Vintage Wrist Watch Company has dated this piece to the 1920s.
The watch has a seven jewel stem-winding movement which is working nicely.
The Tempus name refers to the fact that the watch was made from Thomas Russell, their motto being Tempus Fugit.

The movement is protected by an inner hinged cover.
The watch measures 51mm diameter excluding the winding stem and the loop. The case is stamped as being ‘Silvernus, imitation silver’. Alloys were often used to re-create the silver look, they came with various names such as Silverore, Silveroid and Silverine. The case is in very nice condition, just one small flat area to the side of the case. The style of case, with the stepped detail, is very typical of Thomas Russell watches but it is quite unusual to see a Silvernus example.

The winding crown pushes in to open the front cover.
Inside, there is an acrylic lens which is in good condition.
The dial is signed with both the Thomas Russell and Waltham logos. Blued steel hands (the minute hand is very slightly out of shape), a subsidiary seconds dial and outer minute markers. There is a short hairline between 7 and 8.
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