Fine and extremely rare silver pair case spring detent pocket chronometer by
Thomas Earnshaw, London, circa 1813.
White enamel dial with black numerals and gold hands.
10 jewel fusee movement with engraved cock with diamond cap, "Z" freesprung balance with
trapezoidal weights, gold timing screws and helical hairspring.
The inner case with some small dents.
Thomas Earnshaw was one of England's most illustrious makers. He invented the
spring detent chronometer escapement in late 1780 and his design has been
employed in the vast majority of marine chronometers made since then.
The inner case is hallmarked 1813. The outer case is hallmarked 1848 which
indicates that it is either a replacement or a purpose-made case.
Diameter 60 mm
NOTE: The small circles or shadows in some of our photos
are reflections of the camera lens. Since this watch is much smaller than in the
enlarged photos, a tiny blemish or imperfection that you could not see when looking
at the actual watch can appear very large in the photos.