1950's Longines Wittnauer Jumbo Gents Chronograph 
 
Rather unusual looking watch, in so far as most Longines Wittnauer Chronographs we have seen used Valjoux movements whereas this model features a Venus 170 movement similiar to Breitling models of the same period with a 12/6 sub dial  configuration. It's also larger than most other Longines Wittnauer Chronos coming in at a whopping 37mm diameter ! 
 
The case is gold plated with a steel back and is in very good condition, likewise the dial which shows very little sign of age.
 
The watch is running well  as are the Chrono functions.