Trying to become more educated on 400 Super's. I have read about the differences between 400's and 400 Super's. I understand they were built for 3 months in 1957 starting with serial number 8106131. I also am unaware of a source for specific production numbers. My questions are: What is the latest serial number Super anyone knows of? The latest one I have seen is 8107310, built on September 19, 1957. Also saw a Super Diesel high crop that sold on a Mecum Auction in Davenport, IA in April of 2015, brought $26,000. It was advertised as 1 of 8 built. I see in production numbers that 24 model 403's (Diesel High Crops) were built in 1957, how do we know only 8 of them were Super's? I guess I am curious about production numbers and really the time period these were built (which months in 1957). Thanks in advance.