... Lange first.
Patek's octopus was, apparently, difficult to assemble, adjust and thick.
Lange's mechanism is by far more advanced than the octopus and with better properties, opposite to the octopus' properties simply speaking.
Hence Patek also did a "Lange style" isolator.
Whether Piguet's 1185 movement was equipped with an isolator I am not too sure.
This 1185 was used by Blanc Pain in the L-Evolution R chrono with an added isolator by Blanc Pain (at least that is my understanding).
Unfortunately there is little graphical explanation to this isolator but from the little information available it sound also like the Lange way.
The isolator mechanism of Lange was / is such difficult that I can not go into details without reading again, but I am very positive that this was a great leap forward, a true patent.
Also (added after posting already): Lange's isolator was born out of a true need!
The problem was to ensure a stable amplitude OVER 30 minutes and therefore any existing isolator was not sufficient enough.
Patek is using the isolator for the extra luxury of offering it in a one minute split second measurement.
Maybe also due to marketing aspects and due to production aspects (easier to adjust and use).
Best
Moritz
This message has been edited by COUNT DE MONET on 2016-03-02 04:33:11