Impressive English gold chronometer with power reserve Circa 1918

Gold pocket chronometer by Harrison Mill Frodsham
–
An impressive English 18 carat gold open faced pocket chronometer with 30 hour power reserve, circa 1918. Glazed 2/3 plate movement, a spring detent chronometer escapement, key and crown winding, chain and fusee, duo in uno hairspring in the best quality version AD.Fmsz, a gold screw compensation balance and free swinging blued cylindrical balance spring. Polished silver plated dial with Roman hours, outer minute dots, an outermost Arabic 24 hour track, subsidiary seconds at 6 o’clock, power reserve indication at 6 and blued heavy spade & whip hands. The plain case with an engraved monogram on the back, case maker’s mark HMF for Harrison Mill Frodsham.
Dial and movement signed and numbered, case numbered, case and movement with matching numbers.
–
Diameter: 60 mm
–
Weight: 200 g
–
Signed: Chas Frodsham By Appointment To The King 27 Molton Street London
–
The designation AD.Fmsz on the dial and in the movement stands for the best movement quality manufactured by Frodsham from 1850 onwards.
–
Harrison Mill Frodsham
Born in 1849, Harrison Mill Frodsham was the son of the renowned English watchmaker Charles Frodsham. He took control of Charles Frodsham & Co. after his father passed away in 1871, running the historic firm through the late 19th and early 20th centuries until his death in 1922.

His initials, “HMF,” frequently appear on the hallmarks of high-grade Charles Frodsham pocket watches produced during his tenure, identifying him as the casemaker and director. Like his father, he contributed to horological literature and science, publishing technical writings and maintaining the firm’s reputation for producing record-setting precision timekeepers and complex pocket chronographs.

It is signed with the founder’s name primarily due to brand preservation and corporate legacy. This practice was standard in high-end English watchmaking.