F9F-2 Panther Fighter Cruise Control Computer 1950

This is a Korean War-era Flight Computer designed specifically for the US Navy's first jet fighter, the Grumman F9F-2 Panther, equipped with the J-42 engine.  Also labeled as a Climb and Descent Tabulator and a Max Range Tabulator, it is essentially a 2-disc circular slide rule. 

This 7 inch plastic computer is packaged within its original envelope and comes with instructions for use.