ROSENTHAL GRANDE AND PETITE SONNERIE
CLOCKWATCH AND CHRONOGRAPH YELLOW GOLD
J. W. Rosenthal Paris & London,Grande & Petite Sonnerie Clockwatch
and chronograph. Made circa 1890, No 1237.
Very fine and extremely rare, large and heavy, painted on enamel
and rose diamond-set,trip minute repeating, 18K yellow gold,
keyless, hunting cased, two-train clockwatch with Grande and Petite
Four-body, massive, "pomme et filets", by JW, (master marks),
polished, the front cover with a fine painted on enamel portrait
of a horse rider within a horse-shoe set with rose-cut diamonds
spring loaded front cover, the back applied with a diamond-set
monogram with the letters, protected hand-setting button, thief-
proof swivel bow. Hinged gold cuvette.
White enamel by Willis, i radial Roman numerals, outer minute
track, subsidiary seconds. Blued steel spade hands.
20''', frosted gilt, 3/4-plate, 75 jewels, twotrain with differential
winding beneath the dial, jewelled to the third wheel with screwed
gold chatons, lateral counterpoised lever escapement, cut-bimetallic
compensation balance with gold temperature adjustment
screws, double-over-coiled blued steel Breguet balance spring, diamond
endstone, index regulator, striking on gongs and repeating
activated by a trip-slide on the band, Silent/Strike and Quarters/
Full Strike selection levers on the edge of the bezel.