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This rare surviving O.J. Adder was produced for a limited period of time by the Holman Engineering Anchor Works at Stourport on Severn, England. Designed to add sterling currency it was unusual on account of its solid construction and clock dial readout in units of 20 pounds from 0 to 980 pounds. Only four have so far been identified as having survived (although more may well remain in private possession).
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O.J. Adder Mechanism (from the description in the later 1958 approved patent).
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