The Landeron 39 was a chronograph movement produced in the 1940's and 1950's.
Said to have been designed by James Aubert prior to his death in 1939, the Landeron 39 reflected the state of the art in column wheel chronograph movements at that time. It resembles the Venus 175 family but differs in many details, though both are 7-column designs. It is 14.5 ligne in size with sub seconds at 9 00 and a 30- or 45-minute counter at 3 00.