A blackwood two day marine chronometer, retailed by Thomas Gaunt, Bourke Street, Melbourne, 1880, the silvered dial Roman numerals, fuse movement with maintaining power Earnshaw's spring, detent escapement with compensation balance and helical hair spring, seconds and up/down dials, the brass bowl gimbel-mounted in a blackwood case with swing handles, bevelled glass lid, signed and dated on a mother-of pearl plaque, spring loaded concealed drawer. Accompanied by a Rating Certificate from Melbourne Observatory dated 1885, 18 cm wide, 19 cm deep, the dial 9.5 cm diameter