Swiss rare small marine deck chronometer in transport box Circa 1925

Numbered chronometer with power reserve
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A very rare, small numbered marine deck chronometer made by Ulysse Nardin in le Locle and Genève, Switzerland, circa 1925. The watch comes in a box and the transport box with a carrying strap and its case has a reeded band. The white enamel dial has black Roman hour numerals, a subsidiary dial with black Arabic seconds numerals at six o’clock, a power reserve dial at twelve o’clock and has blued steel hands. The movement has a spring detent chronometer escapement and a 56 hour power reserve indicator.
Boxes and dial have matching numbers.
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Dimensions: 22 x 18 cm (transport box)
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Signed: Ulysse Nardin, le Locle a Genève