Swiss silver deck chronometer with power reserve Circa 1939

Silver open faced deck watch by Ulysse Nardin
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A Swiss deck chronometer with a 40 hour power reserve indicator from the inventory of the Swedish Navy, circa 1939.
Sterling silver, polished case. Engraved silver dome with three crowns and number 15, and with hallmark FFBA 46. Signed enamel dial with radial Roman hours, auxiliary seconds, power reserve indicator, and blued spade hands. Frosted, gilt bridge movement with gold escape wheel on spring detent escapement, Guillaume gold screw compensation balance, blued balance spring, index spring fine adjusting device, ruby endstone on the escape wheel, and chatoned sapphire endstone on balance.
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Diameter: 64 mm
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Weight: 214 g
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Signed: Ulysse Nardin Locle, Suisse
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This watch is, without doubt, a sound example of top quality Swiss watch- and chronometer making. Judging from the identical watch no. 21605, no. 19812 should date from about 1917. That is, however, impossible because the silver case was produced after 1934. Presumably, a number of movements were left over at the end of World War I, for which there was no demand; they were put in storage and fitted into cases just before World War II when the watches were suddenly in great demand. We assume that the watch was finished around 1939, while the movement dates from 1917. According to the Ulysse Nardin records, only 187 examples of this movement type were ever produced.