Patek Philippe & Co.: A gold and enamel open-face keyless chronograph pocket watch in plain case with red and blue enamel monogram to the reverse, the white enamel dial with Arabic numerals and red Arabic five-minute divisions, subsidiary seconds, decorative gold hands, sweep centre seconds operated by a single button in the winder, the signed nickel-plated bar movement jewelled to the centre, bimetallic balance with lever escapement signed and numbered on the movement and cuvette 90320, the case numbered 215791