Patek Philippe "Chronometro Gondolo" 18kt Gold Open-face Watch

Patek Philippe "Chronometro Gondolo" 18kt Gold Open-face Watch, Geneva, no. 168782, enamel roman numeral dial marked "Patek Philippe & Cie, Geneve, Chronometro Gondolo," sunk seconds and gold hands, stem-wind and stem-set movement with gold wheels and lever escapement, marked with maker, location, and number as above, 18kt rose gold engine-turned case with cuvette engraved with information above and "Fabricado escpressamente para Gondolo Labouriau, Relojoeiros, Rio-De-Janeiro," dia. 51 mm, 99g.