Check the listing for details. 1940’s WWII Altitude Correction + 1950’s Pilot’s Intercept Plotting Knee Board. Condition: New. Listed at 45.00 USD. Item #1 is a 1950’s Vietnam and Korea War era Fighter Pilot’s “Intercept Plotting Board” p/n: FNA-340A. Item #2 is a WWII 1940’s era US Army Air Forces / Air Corps Navigation “Altitude Correction Computer” AN 94-27326, p/n: 68629 (AN5837-1). These were for calculating time and distance with altitude correction. Even though items are 60 to 70 year old New Surplus Items, buyer is responsible to make sure that these parts will work for their application as there is no warranty or guarantee expressed or implied.Please Note: Shipping Charges are non-refundable. Items are subject to a 20% restocking fee, on a case to case basis. If you purchase more than one item please wait for an updated invoice with adjusted shipping charges. Thank You