A fine and rare enamel and diamond snake wristwatch, by Bvlgari. Photo Christie's Image Ltd 2014

The coiled sprung bracelet with alternating brilliant-cut diamond-set and black enamel 'scale' links, to the similarly decorated head, with further pear shaped diamond eyes and articulated mouth, opening to reveal the circular watch dial with polished Arabic numerals at the quarter hours, baton hour markers and tapered hands, mechanical movement, circa 1965, maker's case. Signed Bulgari, no.34956A, watch dial signed Jaeger-Le Coultre. Estimate £180,000 – £250,000 ($301,320 - $418,500)

Christie's. IMPORTANT JEWELS, 4 June 2014, London, King Street -http://www.christies.com/