In this rare set you will receive True Air speed Navigation slide rule, pleather like case, and the manual. Please review photos for condition. 

AWESOME, SCARCE, ORIGINAL, VINTAGE, "PILOT'S FLIGHT & NAVIGATION COMPUTER - TYPE Mark VIII-c FDW-31", as made by Telex & Air navigation true airspeed type MB-9, and it comes with the original Instruction Book and the vinyl case

CALCULATES your true airspeed in knots based on sea level temperature, stratosphere temperature, winds, altitude, and other factors! PRETTY COOL - Light wear and soiling to the plastic computer but nothing broken or missing; light wear to the vinyl case; slightly moderate wear and age-toning to the Instruction Book; overall in very good+ to maybe excellent VINTAGE condition!