Instruments · Deck watch
Deck watch no. 52127 by Robert Kunzler
- Maker / attribution
- Robert Kunzler (maker)
- Date
- c. 1911
- Historical period
- Golden Age of Mechanical Watchmaking (1900 – 1945)
- Country of origin
- Unrecorded in source
- Object type
- Deck watch
- Materials / technique
- metal: brass; metal: steel; metal: silver
- Dimensions
- Overall: 64 x 97 x 127 mm
- Holding institution
- Royal Museums Greenwich
- Accession / object no.
- ZAA0157
- Credit line
- National Maritime Museum, Greenwich, London
- Catalogue title (original)
- 52127 (English)
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Record summary
Held and catalogued by Royal Museums Greenwich (object number ZAA0157), this is a deck watch by Robert Kunzler, dated c. 1911. The Atlas places it in the Golden Age of Mechanical Watchmaking period (1900 – 1945) of its Instruments collection. Materials and techniques recorded by the source: metal: brass; metal: steel; metal: silver. Recorded dimensions: Overall: 64 x 97 x 127 mm. The record is illustrated with 1 photograph.
Assembled from the source record's structured fields. Dates and attributions are given as the source states them; where a field is missing the Atlas leaves it blank rather than estimating.
Catalogue description
Catalogue description — Royal Museums Greenwich
Deck watch in silver open-face case, in a wooden deck box. Three-quarter plate movement, signed and numbered, with a lever escapement and compensation balance. The watch has a white enamel dial, signed and numbered and marked with a broad arrow, with Roman numerals and steel spade and poker hands, and a centre seconds indication with a steel hand. The watch is contained in a silver open-face case with a screw-down glazed back. The watch is housed under screw-down glass in a brass canister in a wooden signed and numbered deck box.
Historical context
Golden Age of Mechanical Watchmaking (1900 – 1945)
The wristwatch displaces the pocket watch; waterproof cases, self-winding and grand complications.
Timing instruments became electrical and specialised: industrial time recorders, sports timers and aviation instruments.
Read the period in the timelineMore instruments from this periodEarlier: Industrial Revolution
Atlas type guide
Marine chronometers
A marine chronometer is a precision timekeeper carried at sea to find longitude: the navigator compares local noon, observed with a sextant, with the time at a reference meridian kept by the chronometer. Each hour of difference corresponds to fifteen degrees of longitude. John Harrison proved the method in the 1760s; Pierre Le Roy, Ferdinand Berthoud, John Arnold and Thomas Earnshaw then developed the detent escapement and the compensation balance that made chronometers practical to manufacture.
By the nineteenth century London, Liverpool, Le Locle and Glashütte supplied navies and merchant fleets. A typical box chronometer has a spring-detent escapement, a fusee to equalise mainspring torque, a bimetallic compensation balance with a helical balance spring, and is mounted in gimbals inside a wooden box so that it stays level.
What to look for
- Gimbals and a three-tier wooden box with a glazed inner lid.
- A power-reserve ('up and down') indicator on the dial, usually showing 56 hours on two-day instruments.
- Spring-detent escapement and a cylindrical (helical) balance spring visible through the movement.
- Admiralty or navy marks (broad arrow), and rating certificates from observatories.
- The maker's number on the dial and movement; many makers' registers survive, allowing dating.
Dating clues
- Earnshaw-type spring-detent chronometers became standard after about 1800.
- Auxiliary compensation devices on the balance appear from the mid-nineteenth century.
- Quartz and radio time signals ended routine use of mechanical chronometers in the 1970s and 1980s.
General guidance written by the Atlas editors about this kind of object. It is not a statement about this particular piece; for that, rely on the source record above and on physical examination.
Read next:Spring detent (chronometer) escapementFuseeBalance spring (hairspring)Detent escapement
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