GRANDE ET PETITE SONNERIE CLOCKWATCH
BULLETIN D OBSERVATOIRE YELLOW GOLD
Swiss, retailed by Hauser Zivy & Cie., Mexico-Paris, "La Esmeralda", No 6871.
Made circa 1900.
Very fine and extremely rare, large hunting-cased, 18K yellow gold, trip
minute-repeating, two-train, grande and petite sonnerie keyless Chronometer clockwatch, Bulletin de l'Observatoire obtained at the Observatory of
Neuchatel in 1902.
Four-body "demi-bassine et filets carrure ronde", polished with engine-
turned back. Hinged gold cuvette engraved with the technical and
retail details highlighted with blue, white and black enamel.
White enamel, three-piece with narrow radial Roman numerals, subsidiary
seconds. Black steel pear hands.
44 mm., 19''', rhodium-plated, fausses cotes decoration, twin
barrels with differential tandem winding, 36 jewels, three in screwed
chatons, straight-line lever escapement, cut bimetallic compensation
balance, blued steel Breguet balance spring with overcoil and
swan-neck micrometer regulator, striking and repeating on gongs
by means of a trip slide on the band, sonnerie/silence and petite
sonnerie/grande sonnerie selection levers under the bezel.