Swiss gold full hunter watch with three time zones Circa 1870

Gold pocket watch by Girard-Perregaux, probably Neuchâtel mountains
–
A Swiss, 18K yellow gold hunting cased key-winding pocket watch with three time zones, circa 1860-1880. Made in London.
Gilt ¾ plate movement, lateral lever escapement. Enamel dial with subsidiary seconds at six, Roman radial hours, outer minutes track with Arabic five minutes numerals, Lilly hands, and three-time zones; Western Time at 2 o’clock, East Time at 10 o’clock and Ship Time in the centre. Round-shaped 18K yellow gold polished case.
–
Diameter: 49 mm
–
Signed: Girard-Perregaux London
–
Hand missing