Swiss steel pocket watch with lever escapement Circa 1930

An unusual pocket watch with steel case
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An unusual pocket watch with steel case, made by Patek, Philippe & Co in Genève, Switzerland, circa 1930.  The numbered case was crafted from “Staybrite” rust less steel and the silvered dial features Arabic hour numerals, a subsidiary seconds dial and Breguet steel hands. The numbered movement is fitted with a precision lever escapement and a moustache lever.
The case, dial and movement are signed.
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Diameter: 46 mm
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Signed: Patek, Philippe & C^IE