Rick - This issue seems to be a frequent problem with the older Deuces. This question pops up every week or two - many it seems are being released with only a serial number, model year unknown. You seem to have a significant amount of knowledge on the subject, how about a TA tabulating manufacturers with model year prefixes and serial number range per model year prefix, to the best of information you have available. I.E.,
Kaiser Jeep
Prefix.....Model Year............Serial No. Range
01...........1966- early 67........xxxxx-xxxxx
02...........1967 & 1968...........xxxxx-xxxxx
03............late 68-69?............xxxxx-xxxxx
04...........1969-70..................xxxxx-xxxxx
05...........1970-71..................xxxxx-xxxxx