1960’s Gruen Precision Airflight Jump Hour Gents Watch. 
 
Very collectable and unusual, the premise is simple it has a twenty four dial with at 12am will switch to 13-24 and back to a 12 hour dial when it hits 24. Very novel and rare..
 
Gold plated case with a steel back in excellent condition, the dial shows a little wear on the logos but that noticeable,
 
Inside the case is 17 Jewel Manual movement signed Gruen 
 
Cosmetically. Overall this is in very good condition and running well