I have a 1964 Oliver 550 Special also. The serial number is 149805-019. I purchased it in the original condition in 2001. The tractor came out of Canada. The dealer tag indicated that the tractor was sold at least one time by Vente Sales Canada. I restored the tractor which didn't take long since the tractor was in good condition. Floyd County Museum ran the serial number but have had no luck in finding the built card.