English pocket watch with 30h power reserve indicator Circa 1870

Gold gentleman’s pocket watch by Charles Frodsham
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A gold English gentleman’s pocket watch with 30h power reserve indicator, circa 1870.
The 18 Carat gold tiered case has a gold dome and case maker’s punch mark JM (John Martin, 48 Wynyatt Street, Northampton Square, London); it has a numbered, signed enamel dial with radial Roman hours, auxiliary seconds, and blued spade hands; and the 2/3 plate movement is frosted, gilt, signed, and chatoned, and has optionally key winding or crown winding, chain/fusee, English lever escapement, screw compensation balance, engraved balance cock, and chatoned diamond endstone on balance.
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Diameter: 52 mm
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Weight: 138 g
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Signed: Charles Frodsham
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It must be noted that Charles Frodsham did not create this movement; it was supplied by Victor Kullberg and bears the Kullberg number K 2006. Charles Frodsham (1810-1871) Frodsham was a maker of very fine watches, originally of the Strand, London, and then New Bond Street. His best quality watches bear the letters AD.Fmsz, which is interpreted as 1850, the year he bought J.R. Arnold’s estate after his death; the firm was known for a short period as Arnold and Frodsham. He conducted many experiments with compensated balances and the balance spring to discover their underlying principles; he also wrote several papers on technical subjects.