The Vintage Wrist Watch Company has dated this piece to the 1920s.
There are a couple of empty screw holes showing in the photos... they are not supposed to have screws in as the movement is held in place by the retaining plate within the case.

The watch itself measures 25.5mm wide excluding the winding crown and 33.5mm high excluding the lugs. The case is silver and there are hallmarks on the back of the watch for Glasgow (import mark), 1928 together with a sponsor’s (or importer’s) mark for James Weir. As well as being an importer, James Weir was also listed as being a watch manufacturer, chronometer maker to the Admiralty, jeweller and silversmiths, with premises in both Argyle Street and Buchanan Street in Glasgow. The company James Weir Limited was voluntarily wound up in October of 1928, the year this particular watch was assayed.

The case is in good condition for such an early piece, just some unevenness to the back and a short scratch.
The lens is in good condition.
The signed dial has a little marking but nothing too detrimental at all. Original hands (the finish has faded on the minute hand), a subsidiary seconds dial and a minute track.
A new leather strap has been fitted.
The watch comes in a vintage presentation box, some of the finish has come off and it is a bit tatty but still nice to have.
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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