The Royal Navy's Hydrographic Department was provided with Zenith deck watches during World War 2. At the end of the war, the watches were returned to the Admiralty at Herstmonceux Castle. The dial on this watch downgrades simpler time-telling functions to a small central scale, with the seconds/minutes read off the middle scale emphasised in red. The outer scale denotes 10ths/100ths of a minute.

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