A 20ct gold open-faced quarter repeating ruby cylinder watch with ratchet key

22’’’ gilded movement, large going barrel, ruby cylinder escapement, plain flat three-arm balance with parachute suspension, blued steel flat balance spring and regulator index, bi-metallic compensation curb, repeating train with partially exposed blued steel spring, racks beneath dial, two polished steel hammers repeating on a single steel gong, bottom plate numbered 6564 [sic]

silver engine-turned dial, clous de Paris guilloché patterned centre, twin satin finished chapter rings for hours with black Roman numerals and pearled minutes, crémaillère borders, angled cartouche signed Breguet et fils, blued steel Breguet hands, back numbered B 3564

20ct gold Tavernier case engine-turned à grain d’orge, back centred by small vacant circular cartouche, quarter-turn piston for repeat between I & II, gold hinged cuvette with aperture for winding, cuvette signed Breguet Hor^ger de la Marine Royale, No. 3564, twin crémaillère borders, case back interior with Breguet and Tavernier numbers B 3564, T 3754, Paris assay and discharge marks comprising baby’s head 2 in irregular cartouche (2nd standard gold 840/1000), Pegasus 2 in irregular hexagonal frame (840/1000, 1819-1838), MAB beneath a triangle in lozenge cartouche for Tavernier workshop, all marks repeated to interior of cuvette

Measurements

diameter 53.5mm

case depth 12.5mm

weight (excluding key) 112.7g

Accompaniments

with by gold mounted Breguet ratchet key with steel shank and a Breguet 250th anniversary certificate