Usher & Cole, London Number 2144, The Polished mahogany double-hinged box with lid opening to reveal a glazed aperture, the front with an ivory signature plaque, engraved 'USHER & COLE TWO DAY 2144', the lower section has an inlaid brass star escutcheon as well as campaign style side handles and a full-length hinge to th rear, brass nuts hold the twin trunnions that support the gimbals with a gimbal lock at the lower right corner, a hole for the winding keys is located in the upper right-hand corner, the dial is 4-inch in diameter and silvered, signed 'USHER&COLE LONDON MAKERS TO TH THE ADMIRALTY'. It has a Roman chapter ring as well as an outer minute scale, with a large subsidiary seconds dial between V-VII and three blued steel hands.

The spotted full plate 80mm movement with four pillars and maintaining power to the chain fusee, free sprung blued steel helical balance spring (of ten turns) with diamond endstone, cut and compensated bimetallic balance with cylinder shaped weights and a pair of timing screws, sitting in a weighted, gimballed bowl with sprung dust cover to the winding cover.

Note: according to the vendor the chronometer has been fully overhauled by a clock maker in the past few years.