c.1976 Longines Wittnauer 'Time Machine' Perpetual Calendar Automatic Gents Watch. 
 
You don't see these come up every day. Called the Time Machine, this features 30 years of calendar days and dates, unfortunately it ran out in 2015 ! 
 
However for its time is was something else !  The case is gold plated with a steel back and is in good condition, there is however some plate loss on the bracelet. 
Inside the case is a Longines Wittnauer 17 Jewel Swiss Automatic Movement. 
 
Cosmetically overall this is in good condition and running well