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Patek Philippe: Split Second Chronographs info

Two recently discovered examples from 1922 and 1923, sold for $1.9M and $1.75M, show that Patek Philippe began to build Split Second Chronograph wristwatches earlier than the previously believed 1927. This means that Patek Philippe was the first manufacturer to produce such a watch. The added complication of the rattrapante function, which basically allows the wearer to time two simultaneous events, increased production costs by 40%-50% versus a simple chronograph. Patek has consistently produced split second chronographs to this day, however since the 1971 conclusion of the 1436, they are available only with a perpetual calendar as well. In 1998 Patek introduced Ref. 5070, a simple chronograph modeled after Ref. 2512 below. Perhaps a split second version is in the works.
Ref	Type	Calibre	Start	End	Quant.	Details	Cost Est.	Examples
na	Split-seconds chronograph	12'''	1922	1923	2+	Pink and Yellow gold, enamel dials, functionally as below. Earliest split second chrono ww ever. 235326	$1.78M 99 $1.9M	1922 1923 Antiq 11/99 Gen 448
na	Split-seconds chronograph	13'''	1927	1930		One square pusher for rattrapante, start, stop & return in crown. Two registers, either horizontal or vertical. Likely all Victorin Piguet ebauches. Some with slide to lock out chrono.		Vertical Tonneau Huber 271
na	Split-seconds chronograph	13'''	1937			Victorin Piguet ebauche. Start-stop, reset in crown, square button split above, slide lock 198369 21J (rattapante castle gear near edge)		Huber 273
130	Split-seconds chronograph	13'''-130	1930			Two square pushers, split in crown or crown as button itself. 25J (rattapante castle gear near center) 860841 198405		130 Cartier Huber 272 Negretti 28-29
1436	Split-seconds chronograph	13'''-130	1938	1971		Two square pushers, with the split/catch function in crown or crown as a button itself. Very few rose gold, three stainless known. I use 13'''-130 to differentiate the two types of calibres.	Y:$120K S:$400K	1436 1436 movt Huber 273-274 Negretti 52-53, 60-61, 92-93, 98-99 Patrizzi 235, 236, 238, 239 Antiq 4/00 Gen 406 Antiq 6/98 NYC 491
2512	Split-seconds chronograph	13'''-130	1952			Two square pushers plus crown, large case, black dial. 867857	Y:$636K 96	2512 Huber 274
1563	Split-seconds chronograph	13'''-130	1943	1947	3	Two round pushers plus crown, waterproof, all yellow gold. 867196 tach 862420 puls 863791 Duke E	$200K-$673 Dukes	1563 Negretti 42-43, 68-69 Antiq 6/98 NYC 135
na	Split-seconds chronograph	13'''-130				Two round pushers plus crown, special case (like 5004) 8 posn 25J BiM Bal 862532		Patrizzi 240

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