The Vintage Wrist Watch Company has dated this piece to the 1910s.
The movement has a patent date of 24 May 1904, this relates to a patent in the name of Sandoz.

Cyma was founded by two brothers, Joseph and Theodore Schwob, in 1862. In 1892 they decided to go into partnership with Frédéric Henri Sandoz, owner of Henri Sandoz et Cie. The Cyma name was officially registered in 1903. Sandoz used the most modern of manufacturing processes and produced very high quality time-pieces, trademarked as Tavannes, Cyma and Cyma Tavannes. Their excellent reputation for quality meant that by 1910, Tavannes / Cyma were one of the largest Swiss watch manufacturers in existence.

The movement is protected by an inner hinged cover which has a little unevenness.
The watch measures 50mm diameter excluding the winding stem and the loop. The case is silver and there are hallmarks inside the three covers for London (import mark), 1919 with an importer's mark of JJH believed to be the watch wholesalers Joseph and John Hargreaves. The front of the case has a small central lens surrounded by numbers which originally would have blue enamel infill, over the years quite a lot of this has come out.

The winding crown pushes in to open the front cover.
Inside, the acrylic lens is in good condition.
The dial is in lovely condition with blued steel hands, including the special half hunter hour hand so that the time can be read when the front cover is closed. Subsidiary seconds dial and an outer minute track.
The watch comes in an antique presentation box.
The Vintage Wrist Watch Company has dated this piece to the 1910s.
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