Very accurate shot in the dark, Treadders. Cessna CH-1 Skyhook (aka YH-41 Seneca in military guise) it was. The only helicopter Cessna ever built (and which some folk at Wichita deny they ever did). Just one known survivor, at the Museum of Army Flying at Fort Rucker, AL. Cessna bought back all the commercial Skyhook models and bulldozed them into a big hole. Your call.