On Kaiser M35A2 trucks 01 is 1966, 02 is 1967, 03 is 1968, 04 is 1969, and 05 is 1970. Am General carried the first 2 numbers for several years. The 46 designates it as a M36A2. The last 5 numbers are the sequential numbers of truck made that year. You might have a 1969 M36A2 that begins with 0446 that still has 10172. Even the Kaiser trucks seemed to have some carryover into the next year. What I base this on is actual truck numbers that follow this pattern. That first post was showing 1970 trucks with the different numbers for different models. Thanks for the help.