Lot Essay
Thomas Frederick Cooper, London were watchmakers of repute, recorded between 1820-1840.
Details
T.F. COOPER. A GOOD QUALITY TWO-TRAIN TWO-TIMEZONE FLYING FIFTH OF A SECOND OPENFACE POCKETWATCH
signed T.F. Cooper, London, no. 1209, circa 1830s
the frosted gilt two-train movement with uncut bimetallic balance, parachute shock protection, bimetallic temperature curb, counterpoised lever escapement with double escape wheel, 21 jewels, the white enamel dial with outer seconds ring calibrated in fifths of a second with Arabic five minute divisions, sweep centre seconds, eccentric Roman chapter rings for the two timezones, subsidiary dial for flying fifth of a second, in a plain case with engraved design to the back and milled band with slide to stop or start the second hands, signed and numbered on the cuvette and numbered to the case - 54mm. diam.
signed T.F. Cooper, London, no. 1209, circa 1830s
the frosted gilt two-train movement with uncut bimetallic balance, parachute shock protection, bimetallic temperature curb, counterpoised lever escapement with double escape wheel, 21 jewels, the white enamel dial with outer seconds ring calibrated in fifths of a second with Arabic five minute divisions, sweep centre seconds, eccentric Roman chapter rings for the two timezones, subsidiary dial for flying fifth of a second, in a plain case with engraved design to the back and milled band with slide to stop or start the second hands, signed and numbered on the cuvette and numbered to the case - 54mm. diam.