Accompanied by Patek Philippe Extrait des Registres confirming production of the present watch with independent dead-seconds in 1911 and its subsequent sale on 15 December 1931.
The independent dead seconds mechanism requires two going trains, one for the movement and one for the sweep centre seconds hand, allowing it to be stopped without stopping the main train in order not to interfere with the accuracy of timekeeping. The invention of this mechanism is attributed to Moise Pouzait, Geneva 1776.
Adrien Philippe's independent dead seconds mechanism (Swiss patent No. 1017 of 23 May 1889, illustrated and described in Patek Philippe by Martin Huber & Alan Banbery, p. 53) varies completely from Pouzait's design. Moving the seconds train over the center bridge created more space, thus allowing a larger balance resulting in better timekeeping.
A similar, hunter case watch is illustrated in Patek Philippe by Martin Huber & Alan Banbery, p. 195.
We are indebted to Dr. Helmut Crott respectively TheSourceTECHdata for the valuable help in researching this lot.