Information on what makes an early 1951 Kaiser Special vs. a "series 2" Special and a later Special will be found under the 1951 Kaiser Special topics in KFOCI HANDBOOK along with dates and other cut point type information. There were in fact a number of changes to the 1951 Kaisers between start of production in late March 1950 and the last cars off the line at Willow Run on November 4, 1951.
The 1951 Kaisers are just one reason why WRITTEN judging standards, available to owners and judges alike are so critical, a fact that escaped club management for over 50 years!