Well I followed the guide on OldMiniBikes, looked at my old and newer Teke manuals and still come up with the same what year is it insanity. I'ts a H50-65410N Ser 3108D. But how can I tell if its a 1973 or 1983 ??? I included a picture of the Beast if it helps any, (took off the gas tank). Any inflammation on this is most appreciated, (no pun intended).