Patek Philippe & Cie. , Genève, No. 863631, case No. 642403, 1930's. Very fine and rare, early 18ct gold, gentleman's wristwatch, with square button chronograph. registers and tachometer. massive, polished. concave bezel. mat silver, with applied gold Breguet numerals + auxiliary seconds and 30 minutes register dial, outer tachometer graduation. "Spade" gold hands. 13". rhodiumed. "fausses-côtes" decoration, 23 jewels. lever escapement. monometallic balance adjusted to 8 positions, self-compensating Breguet balancespring, micrometer regulator. Dial, case and movement signed. In excellent condition. Diam. 33 mm. Notes A similar watch is published in "Patek Philippe Wristwatches". page 201.