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Patek Philippe: Tourbillons and Observatory Watches info

Patek Philippe began work on its first tourbillon pocket watch in 1864, a 20 ligne movement with stem winding. In 1945, Andre Bornand, master watchmaker at Patek Philippe and professor of escapement design at the Geneva School of Horology, developed wristwatch movement 861,115. This 30mm movement was designed to compete in the Geneva Observatory competition. He was also responsible for the 1.018 gram bronze berylium tourbillon cage (including the whole escapement) in tonneau-shaped Calibre 34T, Patek's first tourbillon produced in series. Between 1943 and 1966, Patek submitted simple calibre wristwatches (cat D) to the Geneva Observatory 480 times, and tourbillon wristwatches 27 times. Individual movements may be submitted several times over the years, so it is difficult to determine the actual number of movements produced. For simple calibres, I estimate that Patek's production during these years is between 100-200, plus 6-10 Tourbillons.
Ref	Type	Calibre	Start	End	Quant.	Details	Cost Est.	Examples
570	Observatory	13'''	1939			Lepine ebauche
	Tourbillon	13.25'''	1949	1949	1	First Geneva Competition Tourbillon by Andre Bornand. No. 861,115 Round, 1 minute tourbillon, 18 jewels, Guillaume Balance, freesprung Breguet overcoil, straight line lever escapement, precision timing by Zibach.		Huber 256
2458	Observatory	13'''	1952			Lepine ebauche, Guillaume balance, Breguet overcoil, 20J. JB Champion 861,121		Huber 253
	Observatory	13'''	1953			Guillaume balance, Breguet overcoil, 18 jewels, precision regulation by Mathez. 861,126		Huber 255
2556	Observatory	13'''	1954	1954	1	Guillaume balance, Breguet overcoil. 21 jewels 861,137 43.77 points (56.34 is record for C - small pocket)	$200+	2556 Huber 254 Patrizzi 215
3834	Tourbillon	34T	1956	1966 1980	5	Rectangular, 50 second tourbillon, 23J, Guillaume balance, Duofix shock-absorbers, freesprung Breguet overcoil, straight line lever escapement, 21,600 vph, 57 hour reserve. Subseconds mounted on extra wheel off last arbor of train, at 8 o'clock. 54.83 points awarded in 1958 861,490 & 866,500-503 Cased in 1980 Calibre 34T is a Zibach/Jaccard Calibre 34S (702mm² Geneva Observatory Competition Cat D ebauche) with a Bornand tourbillon. See Huber I 81-83	$440 1989	3834 34T Huber 256 Huber I pl 145 Patrizzi 214

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