Unusual Swiss silver concealed medallion watch Circa 1922

Unique hunting cased lever watch by Patek Philippe & Co.
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An unusual and possibly unique Swiss silver concealed medallion watch, circa 1922. It has an 8.5″ ligne movement with a lever escapement. White enamel dial with hairlines, Breguet numerals, outer minute track, and blued spade hands. Silver hinged repoussé hunting case with, on the front, a medallion reading Marie a été Conçue sans Péché (Mary was conceived without sin), and on the back, a medallion reading Cor Meeum Jungatur Vobis (May My Heart Be United With You), and a snap-on case back. Dial and movement signed Patek Philippe, case unmarked.
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Diameter: 34 mm
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Signed: Patek, Philippe & Cie. Genève
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The case is in fair condition, displaying wear and scratches consistent with its age. The hinged hunting case reveals signs of restoration in the upper quadrant, while the outer case band shows minor nicks and slight warping. Age-related patina is visible throughout. The bow has overall nicks as well. This piece is crafted from materials provided by the original client, and the case remains unsigned. The dial exhibits discoloured hairlines between 12 and 1, with light wear and some dust present. The movement shows mild wear and scuffs but is currently running.