Thomas Mercer Ltd. two-day marine chronometer, no. 16958, si...

Thomas Mercer Ltd. two-day marine chronometer, no. 16958, signed 4.25" silvered dial with Roman numerals, outer minute track, fifty-six hour power reserve indicator over a constant seconds dial, brass full plate fusee movement with maintaining power, Earnshaw type spring detent escapement and split compensated balance with a helical hairspring, in a brass case with a sliding winding hole shutter and gimbal mount within a square glazed mahogany case bearing the brass numbered plaque, 7.25" (with key) ** with a Thomas Mercer Chronometer Rate Certificate and Guarantee (unstamped)

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