Swiss stainless steel observation pocket watch Circa 1920

Steel deck watch with open face by Ulysse Nardin
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An extremely rare Swiss Ulysse Nardin observation deck watch with steel case, circa 1920. The timepiece features a precise lever movement with fine adjustment, identified by the work number 92532. It showcases a signed silver-plated dial with Arabic radial hours, an outer minute track, a subsidiary dial for the seconds, and remarkable steel hands. It has a large polished stainless steel case and bears the serial number 39788.
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Diameter: 57 mm
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Weight: 88 g
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Signed: Ulysse Nardin Locle Suisse
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Ulysse Nardin, Swiss watch manufacturer
The company was founded in 1846 by Ulysse Nardin in Le Locle, Switzerland. Ulysse Nardin is the founder of the Swiss marine chronometer industry along with Louis JeanRichard-dit-Bressel and Henry Grandjean.
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The current president and owner is Rolf W. Schnyder. He took over the company in 1983. Through his collaboration with the watchmaker and inventor, Prof. Dr Ludwig Oechslin created several famous astronomical models, such as the astrolabe, the planetarium and the tellurium – Johannes Kepler.