The Vintage Wrist Watch Company has dated this piece to the 1920s.
The movement is protected by an inner hinged cover.

The watch measures 50mm diameter excluding the winding stem and the loop. The case is silver and there are hallmarks inside both of the back covers for Birmingham 1924, with a maker’s mark for the English watch case maker Aaron Dennison. The back of the watch has engine turned detail with a central vacant cartouche. The front of the watch is in good condition - there are three or four little indentations to the case back.

The watch glass has minor marks but barely noticeable to the naked eye.
The enamel dial is signed with the original jeweller’s name of P G Allder, Luton. They were jewellers and opticians and still exist today as opticians - the jewellery section of the business was sold off in the 1920s.
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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