Fine Swiss ‘Art Deco’ yellow gold and enamel watch Circa 1921

Yellow gold and enamel watch by Patek Philippe
–
A fine and rare Swiss ‘Art Deco’ yellow gold and enamel open faced keyless watch, circa 1921.
Brass gilt moustache lever escapement movement, cut bimetallic compensation balance with peripheral timing screw, blued Breguet balance spring with terminal curb, yellow gold dial, enamel Breguet numerals, blued steel spade hands, subsidiary seconds, inner engraved circle, outer minute track, 18k yellow gold open faced case, Art Deco engraving on bow, translucent blue enamel on band, movement and dial signed, case stamped.
–
Diameter: 44.5 mm
–
Signed: Patek, Philippe & Co Genève
–
With an Extract from the Archives confirming manufacture in 1921 and sale in 1922.