Roy C Harris FBHI
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UK Specialist in the Service and Restoration of Marine Chronometers

THE WORSHIPFUL COMPANY OF CLOCKMAKERS

THE BRITISH HOROLOGICAL INSTITUTE

HISTORICAL MARITIME SOCIETY

RICHARDS OF BURTON (CLOCKMAKERS)

ANTIQUARIAN HOROLOGICAL SOCIETY

MAYFIELD BOOKS

GREAT DUNMOW MUSEUM

HISTORY OF TIME BY AIDEN SCHAFFER

ROYAL MUSEUMS GREENWICH