Polaris Air Transport Covair (sic) 240 (LN-KLT)
Our favourite web sources for information about aircraft registration numbers lead to at least three different types of aircraft for this number, but it seems certain the aircraft you see was parked by a highway in Netherlands and broken up sometime around 1976. The postcard is newer; it shows the plane in 1967, but was mailed in 2012 from Czech Republic with stamp, Prioritaire label, and two clear postmarks. Grade: 2