An ultra-thin Swiss pink gold open faced watch Circa 1941

An ultra-thin swiss pink gold open faced watch by Patek Philippe
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An ultra-thin swiss pink gold open faced watch, circa 1941
Extra flat manual winding jewelled lever movement, cut bimetallic balance.
Salmon dial, applied Roman numerals and baton indexes, outer minute track, 18k pink gold thin polished case, partially ruby-set bezel, snap-on back, case, dial and movement signed.
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Diameter: 43.5 mm
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Signed: Patek, Philippe & Co Genève
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With an Extract from the Archives confirming production in 1941 and sale in 1943, gold chain and presentation case.