Thomas Mercer Marine Chronometer 1940 - 1960

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Cataloguer’s Note

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Frequently Asked Questions

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Cataloguer’s note

Written by Sellingantiques from the dealer’s photographs and listing

ObjectClocks
Period1940 - 1960
StyleMaritime
MaterialMahogany, Brass, Glass
ColourWarm Brown
MotifsGimbal mount, Roman numerals, mahogany casing, glass viewing aperture

This two day marine chronometer by Thomas Mercer originates from the mid twentieth century in a maritime style. The piece comprises a warm brown mahogany casing with square proportions, brass fittings, a hinged two tier glazed lid with a glass viewing aperture, and a baize lined deck box containing a brass gimbal mount. The instrument holds a four inch white dial featuring Roman numerals, a subsidiary skeletonised seconds dial, a power reserve dial, and a visible escapement. The chronometer measures 19.5 x 20 x 16.5 cm, while the outer deck box measures 23.5 x 29 x 22 cm. Placed on an office desk or library table, it brings functional navigation history into a study interior.

FAQs

A marine chronometer is a precise portable timekeeper used at sea to determine longitude via celestial navigation. First perfected in the eighteenth century, these horological instruments provided the accuracy necessary for safe ocean navigation.

Traditional marine chronometers feature a brass clockwork movement suspended within adjustable brass gimbals. This assembly is housed inside a fitted hardwood box, typically mahogany or walnut, featuring a glazed lid to allow viewing while protecting the mechanism from marine air.

Authentic pieces feature maker-engraved brass or silvered dials detailing the maker name and location, alongside matching serial numbers on the movement and case. Genuine examples showcase precision engineering, including specialized balance wheels designed for temperature compensation and a functional gimbal mounting system.

A boxed marine chronometer acts as a focal point when placed on an office desk, library bookshelf, or sideboard. Pairing the instrument with leather-bound volumes, brass accessories, or framed maritime charts complements its historical aesthetic.

Store the instrument in a climate-controlled environment away from direct sunlight, moisture, and extreme temperature fluctuations. The mechanical movement requires regular winding with the correct key and periodic inspection by a professional horologist to ensure clean oiling and proper operation.

Hatchwell Antiques

2 Day Marine Chronometer by Thomas Mercer