Swiss gold pocket watch with extra quality movement Circa 1915

Gold watch made for Tiffany & Co., New York
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A Swiss 18 carat yellow gold keyless pocket watch with extra quality movement, made by Patek Philippe in Geneva, circa 1915. Open faced with a hinged case back, bezel and gold cuvette. Case back engraved in taille–douce (fine-cut) with the cypher E M B. Champagne dial with Arabic numerals, outer minute track, subsidiary seconds and blued steel spade hands. Extra thin, rhodium plated movement, going barrel, gold screwed chaton setting on the central wheel, straight line lever escapement, cut bimetallic compensated balance and blued steel hairspring with terminal curve, polished steel index regulator, extra quality, eight adjustments. Signature on the dial, case and movement.
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Diameter: 45 mm
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Signed: Patek Philippe/Tiffany & Co., Switzerland
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Accompanied by an extract from the Archives.
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The Extract from the Archives, dated February 15, 2021, mentioned that this watch was sold on May 10, 1916 (remark: the original case was replaced with a Tiffany case bearing No. 186 104).