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Updated Daily: January 2009

Ron DeCorte: Patek Philippe Ref 5960 Annual Calendar Chronograph

The Ref 5960, Patek Philippe's first in-house chronograph, is generating great excitement among enthusiasts. In an exclusive review, master watchmaker Ron DeCorte gets between the plates for a detailed look at this instant classic.

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Technical Data
Movement : Caliber CH 28-520 IRM QA 24H
Movement diameter : 33 mm
Movement height : 7.68 mm
Number of parts : 456
Number of jewels : 40
Power reserve : 55 Hours
Balance spring : Breguet
Frequency : 28,800 @ hour (4 Hz)
Case : 950 Platinum
Case dimension : 40.5 mm
Case height : 13.5 mm
Strap : Hand stitched brown alligator with 950 platinum bi-fold buckle.
© Ron DeCorte 2006

Text and Photography RON DECORTE

Ron DeCorte

Ron DeCorte is an Independent Watchmaker who has conceived and created his own unique watches, and worked extensively with other distinguished watchmakers in Switzerland. He was president of the American Watchmakers Institute (AWI) in 2000 and 2001, and was awarded the AWI Lifetime Achievement Award in 2003. He specializes in the restoration of mechanical watches, writes extensively regarding horological issues, and lends advice to the micro-mechanical arts. All photographs contained in his articles, unless otherwise noted, are made by him on location and without the use of studio techniques.