English watch with 30h power reserve indicator Circa 1915

Hunting cased gold pocket watch by Usher & Cole
–
An English hunting cased pocket watch with 30h power reserve indicator, circa 1915.
18 carat gold case with case maker’s punch mark “PJ”; white enamel dial with Roman hours, sunk subsidiary dial for the seconds, sunk dial for 30h power reserve and spade hands; signed 2/3 plate movement, English lever escapement and a screw compensation balance.
–
Diameter: 50 mm
–
Weight: 113 g
–
Signed: Usher & Cole, Clerkenwell, London