Patek Philippe. A gilt metal electronic marine chronometer with sweep centre seconds, in mahogany box

Patek Philippe. A gilt metal electronic marine chronometer with sweep centre seconds, in mahogany box
Signed Patek Philippe, Genève, Naviquartz III model, ref. 1215, movement no. 1'800'420, manufactured in 1975
Cal. 33 quartz movement, white matte dial, Roman numerals, black moon-style hands, sweep centre seconds, outer railway minute divisions, set within a gilt metal frame with power indicator, circular black metal case with screw back, all set within a hinged three-tier mahogany deck box, hinged gilt brass stand to the reverse, case, dial and movement signed
125 mm. wide & 160 mm. overall length