Post Office wall clock by SMITHS with 'tuning fork' movement and 12 inch dial, 1974

Traditionally, Post Office clocks were pulse type, driven by a master clock, or less commonly mains electric. Battery clocks were not adopted by the Post Office until 1974. This was the first, PO No. 110, made by Smiths.

The clock has a 13 to 24 hour dial (for use where operations were based on 24 hour timings) set in a taupe melamine case. It is driven by a Smiths ‘tuning fork’ movement with a smooth-sweeping red second hand. This movement, originally developed by Accutron, marked the pinnacle of electro-mechanical timekeeping. Shortly afterwards the first quartz clocks appeared and time was up for electronic and electromechanical movements.

The clock has been disassembled, cleaned, serviced and polished and is supplied in excellent condition and full working order (it takes a single C type battery). All electronic movements can be regulated and with patience something approaching quartz accuracy can be achieved.

Dial diameter 12 inches (305mm); overall diameter 356mm; depth 70mm

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