Just got the Build Card for my 1966 (I think) Oliver 1950. According to the Build Card was a retuned tractor after being sent to A Growing O show. but the Card shows it to be MFWD (its not). 23.1-34 tires (they are 18.4-38). 1000 only PTO (its dual speed). The Card also shows Crown Fenders, but my tractor has Fuel Tank Fenders. This tractor has 2 Build Cards. On the back of the card there is notes saying not at Oakland, Not at Peoria 10-27-69, and Not at Omaha 10-27-69. The build dates on the back of the card are from April to August 1966. Did someone switch the Serial # plate at some point in the life of my tractor? The engine has been changed by the prior owner so Engine serial number doesn't help. Any help would be appreciated. Steve.