Patek Philippe. An aluminium electronic marine chronometer with sweep centre seconds and original mahogany box

Patek Philippe. An aluminium electronic marine chronometer with sweep centre seconds and original mahogany box
Signed Patek Philippe, Genève, Naviquartz model, ref. E1200, movement no. 700'190, manufactured in 1971
Cal. 33 with quartz standardization, black dial, inner Arabic numerals, Arabic seconds indication to the outer raised chapter ring, in black painted cast metal case with chromium plated bezel, hinged stand to the reverse, case, dial and movement signed
140 mm. wide & 200 mm. overall length