Kembery Antique Clocks Ltd has dated this piece to the 1940s.

Below is an excerpt from 'A concise guide to Military timepieces 1880-1990' by Z M Wesolowski.
After the war the deck watches went into storage at the Chronometer section of the Hydrographic Department at Hermonceaux Castle; there during the 1950's they had their enamel dials replaced with special decimal dials using smaller hour and minute hands. the dial layout gives emphasis to minutes, which are picked out in red on the intermediate chapter ring and an outer ring has been calibrated to indicate 100 units per minute. These watches were particularly useful for rapid mathematical calculations.'

Case width 54mm
From Kembery Antique Clocks Ltd you can expect a genuine antique pocket watch that has been serviced with 12 months guarantee. Carefully packed and sent by tracked and insured delivery on a day of your choice.
Kembery Antique Clocks Ltd has dated this piece to the 1940s.
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