271
271
Urban Jürgensen & Sønner Copenhagen/Derek Pratt
AN ELEGANT AND SLIM ART DECO STYLE TWO-COLOUR GOLD OPEN-FACED PERPETUAL CALENDAR KEYLESS LEVER WATCH WITH MOON-PHASES NO 3002 CIRCA 1985
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271
Urban Jürgensen & Sønner Copenhagen/Derek Pratt
AN ELEGANT AND SLIM ART DECO STYLE TWO-COLOUR GOLD OPEN-FACED PERPETUAL CALENDAR KEYLESS LEVER WATCH WITH MOON-PHASES NO 3002 CIRCA 1985
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Details & Cataloguing

Important Watches

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Urban Jürgensen & Sønner Copenhagen/Derek Pratt
AN ELEGANT AND SLIM ART DECO STYLE TWO-COLOUR GOLD OPEN-FACED PERPETUAL CALENDAR KEYLESS LEVER WATCH WITH MOON-PHASES NO 3002 CIRCA 1985
• 18” Le Coultre ébauche, circa 1915, manual winding lever movement, Breguet bi-metallic compensation balance, 17 jewels • silvered guilloché dial, Roman numerals, outer minute track, subsidiary dials for day, date, months calibrated for leap cycle, constant seconds combined moon-phases, Breguet style gold hands • 18k white and yellow gold stepped case, snap-on back • case and movement signed  
 
diameter 52 mm
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Literature

John M. R. Knudsen, The Jürgensen Dynasty, 2013, pp. 318-319, pls. 513 and 516

Timothy Treffry, Derek Pratt Watchmaker FBHI, British Horological Institute, 2012, p. 103

 

Catalogue Note

Accompanied by M.R. John Knudsen, The Jürgensen Dynasty, 2013 and a copy of the Urban Jürgensen companycatalogue c. 1992.

Derek Pratt hand finished the ébauche of the present lot at the Urban Jürgensen Sønner workshop in the mid 1980s.

N0 3001 is the second in the famous 3000 series of complicated pocket watches, which includes tourbillons, perpetual calendars and grand complications with minute repetition, split seconds and perpetual calendars. Each watch in the series is different and unique in its fabrication.

Although the series’ numbering reaches as high as 3065, according to the firm’s archives, approximately just 30 to 35 pieces were actually produced.

A testament to the complexity of the systems employed by Derek Pratt is the fact that the chapter ring for hours and calendar subsidiary dials were finished using five engraved plates for the separate calibrations.

The Perpetual calendar system employed in this watch is based on the system invented by Charles-Henry Audemars in 1862.

Important Watches

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Geneva