AN ELECTRO-MECHANICAL MASTER CLOCK BY THOMAS MERCER, CIRCA 1961

the 5½in. silvered dial signed as per title and numbered '1122', subsidiary seconds at '12' with inspection port by '60', blued-steel hands, ports for time and stop/start with removable plug, mounted in coated aluminium case with hinged front access, vertical going-barrel movement in counter numbered frosted plates with standard Mercer balance and electric 30 second winding mechanism with battery support, wiring schematic to inside back, threaded humidity plug to top, ten pin electric socket to right and the back with three sets of contacts -- 12 x 9¼ x 4in. (30.5 x 23.5 x 10cm.) overall

Literature: Betts, J: Marine Chronometers at Greenwich, OUP, 2017, p.670-672

This instrument was deaccessioned from the Admiralty Compass Observatory, Ditton Park, and retained by a compass technician who retired in the 1990's

According to Jonathan Betts book, Mercer's publicity advertised that this instrument could be used '...in Observatories Laboratories, Factories, Lighthouses and Lightships'.

Condition Report

Movement clean and untouched - compartment had not been opened until consigned for sale, batteries flat but uncorroded, as no 10-pin lead available movement has not been tested or run.

We are pleased to provide you with a general report of the condition of this property. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Charles Miller Ltd is merely a subjective, qualified opinion. Prospective buyers should also refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue. NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD “AS IS” IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE.