JONATHAN ROBSON

Y A GEORGE III SILVER TRIPLE-CASED VERGE POCKET WATCH JONATHAN ROBSON, LONDON, 1762 The gilt full plate fusee movement with four square section baluster pillars pinned through the backplate, scroll-pierced stop-iron block and verge escapement regulated by sprung three-arm steel balance with Tompion type regulation, the backplate with fine symmetrical foliate scroll pierced and engraved balance cock with grotesque mask at the junction with the conforming pierced and engraved foot, flanked by silvered regulation disc set within adjacent applied scroll engraved panel infill opposing signature Jn'o , Robson, London , and numbered 15337 , the circular white enamel Roman numeral dial with Arabic five minutes to outer track and fine sculpted blued steel beetle and poker hands, the first case applied with suspension post and bow at twelve o'clock, the second case with moulded rim to circumference and engraved with initials G R J to rear and the outer base metal applied with tortoiseshell pinned near the conforming silver rim mouldings, the inner marked for London 1762 makers HB . The pillar plate 3.6cm (1.375ins) diameter, the inner case 4.2cm (1.675ins) diameter; the outer case 5.7cm (2.25ins) diameter. Although numerous watch and clock makers with the surname Robson are recorded working in London during the second half of the 18 th century none with Christian name Jonathan or John are noted.