Ok, back to the bike. I have an MXII and a 600a (102b, 500a). The frame has the same top tube measurement as my 600a and has a gusset behind the seat tube like my 600a, but the forks have holes drilled in them, instead of the end caps, and the headtube decal looks like a Proline or PL-20 (I think??). Help, please......pics are below.

Headtube decal appears to be original (Proline, PL-20???)

Look at the bottom of the forks in the pic below

RC serial number....'83, right??

