• cal. 28-20 manual winding nickel lever movement stamped with the Geneva seal, one-minute tourbillon carriage with Gyromax balance • pink champagne dial, applied Breguet numerals, feuille hands, subsidiary dial for constant seconds, 10-day power reserve indication • platinum rectangular case with stepped sides, chamfered ends, diamond accent between the lugs at 6 o'clock, sapphire crystal display back secured by 4 screws • case, dial and movement signed • with a platinum Patek Philippe buckle

Movement and fucntions are in working order while cataloguing. Case with light suface scuffs, very clean in general. Strong hallmarks, no signs of any polishing. Buckle with light signs of use. Overall condition is very good. Dial is lightly spotted towards the center. However, should the buyer request, please note that ONLY the cost of servicing the dial by the manufacturer will be covered by the seller after the lot is sold. After service, the dial will look like new. **The strap of this wristwatch is made from an endangered species, please refer to important notices for further information**.
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective, qualified opinion. Prospective buyers should also refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE."

With a Patek Philippe Philippe Extract from the Archives and a presentation box. 

Pa🎉tek Philippe launched the Ref. 5101P in 2003 as a tribute to a rectangular tourbillon wristwatch produced circa 1956 and illustrated in Huber, M. & Banberry, A., Patek Philippe Pocket Watches, Vol. 1 Second Edition, pp. 178-179.  Available exlusively in platinum when first released the metal was discontinued in 2009 when it was replaced by a pink and later yellow gold case.

It took Patek Philippe engineers three years to develop a new tourbillon movement able to withstand the tourque tollorences required to allow the watch to run for 10 days and 🍎when launched was the fist of its kind. To prevent the minute wheel from obstructing the view of the tourbillon from the reverse, the entire going train was relocated to the dial side.  The tourbillon is now showcased on the bridge side as the dominant element and is beautifully revealed through the sapphire crystal display back.  The rotating cage alone is composed of 72 miniscule individual parts, and only weighs 0.3 grams.

Powered by tandem mainsprings to provide the 10-day power reserve, both barrels are wound simultaneously, the larger barrel wound directly and transfering power to the smaller.  The first barrel is equipped with a system containing a slipping bridle, which prevents both mainsprings from being over-wound and disengages the barrels when they have reached their winding limit.  It 🐟takes a Patek Philippe watchmaker up to 3 months to produce a Ref. 5101 from bওeginning to end.