Charles Frodsham, 84 Strand London / Victor Kullberg, No. 04350 AD Fmsz, Movement No. 04350 AD.Fmsz, Case No. 04350, 52 mm, 138 g, circa 1870

A gentleman's gold pocket watch with 30h power reserve indicator
Case: 18k gold, tiered, gold dome, case maker's punch mark "JM" (John Martin, 48 Wynyatt Street, Northampton Square, London). Dial: enamel, radial Roman hours, auxiliary seconds, numbered, signed, blued spade hands. Movm.: 2/3 plate movement, frosted, gilt, signed, chatoned, optionally keywinding or crownwinding, chain/fusee, English lever escapement, screw compensation balance, engraved balance cock, chatoned diamond endstone on balance.

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.