JUSTIN VULLIAMY, LONDON. A FINE GOLD PAIR CASED DUMB QUARTER REPEATING CYLINDER WATCH 1788, NO. OSO

Description

Movement: gilded full plate, cylinder escapement, decoratively pierced balance cock engraved with foliage, a mask at the neck, diamond endstone, elaborately coiled serpent indicating to silver regulator plate, two polished steel hammers repeating on blocks secured to inside case back, fusee and chain, cylindrical pillars, signed and numbered Just. Vulliamy, London, OSO, plain gilt-metal dust cap 
Dial: white enamel, Roman numerals, outer Arabic minute ring, blued steel beetle and poker hands
Cases: gold inner, the back with engraved classical urn with dated monogram LS 1787, stirrup-form bow with chased leaf-form sides, pulse piece beneath bezel at 5 o'clock • gold outer case centred with cartouche engraved with the arms and motto of Frederick Irby, third Baron Boston, surrounded by engine-turned decoration with inset polished roundels, both bezels engraved with scrolls and foliage, both cases hallmarked 1788 and with maker's mark WQ incuse for William Quinton
diameter of outer case 53mm, inner case 46.5mm