Rare English silver open faced pocket chronometer Circa 1854

Pocket chronometer by Charles Frodsham
–
A fine, rare and large English silver open faced keywound pocket chronometer, circa 1854. Gilt finished chain fusée movement, Earnshaw spring detent escapement, large bimetallic balance with cylindrical compensation weights, freesprung blued steel helical hairspring, diamond endstone. Silver cuvette. White enamel dial, Roman numerals and subsidiary seconds. Large plain case, engine turned hinged back. Case and cuvette numbered, stamped with casemaker’s initials WB and London date letter for 1854, dial and movement signed and numbered.

–
Diameter: 60 mm
–
Signed: Chas Frodsham 84 Strand London