Watch by John Jefferys, commissioned by John Harrison in 1752
- Made:
- 1752 in London and Cirencester
Silver pair cased watch by John Jefferys, London, 1753. Silver case stamped T.C. White eamel dial (blackened as a result of fire). Centre seconds. Harrison's special verge escapement with diamond pallets. Contains the first maintainin power and first temperature compensation ever fitted to a watch. Signed "John Jefferys London" on back plate and "John Jefferys. London AD 1753" on dust cap. This was Harrison's personal pocket watch and the prototype for his prize-winning 4th Marine Timekeeper.
Details
- Category:
- Clockmakers
- Collection:
- The Worshipful Company of Clockmakers
- Object Number:
- L2015-3215
- Materials:
- silver (metal), brass (copper, zinc alloy), steel (metal), diamond, enamel and glass
- Measurements:
-
overall: 70 mm x 60 mm x 35 mm,
- type:
- watch and verge movement
- credit:
- Lent by Hull Trinity House
