I think it's a 1968. The serial number for 1968 & 1969 shared the CL350-1000001 starting point, which would put yours early in this run. Also, there was a lower stripe added to the tank for 1969, which I don't see.
Edit: I just ran across your restoration thread. Apparently you've already figured this out. Hahaha, apologies for beating a dead horse.