Sounds like someone did some title swapping at one point.I once bought a what was supposed to be a 1956 Ford pickup,according to the title,later on the state police discovered someone had taken a 55 and a 56 truck and made up one to sell. However they used the wrong title. I guess if your VIN plate on the truck says it is a 1961 and the title has that same VIN on it it is legal. Just my guess.