Rare English two-day “Octo” survey chronometer by Thomas Mer...

Rare English two-day “Octo” survey chronometer by Thomas Mercer, St Albans, No. 15430, the 4" silvered dial signed 'Thomas Mercer Maker to The Admiralty, Eyewood Road St Albans', twenty-four hour Arabic numeral dial with blued steel hands, Up and Down power indicator and off-set seconds ring with visible contacts for one second electrical pulses, in a spun aluminium case with glazed lid, start/stop lever and spare glass, 6” diameter, 3.5” high ** From the David Read Collection

Estimate:£400

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