Problem is the Alloy Tank has a paint job that I have never seen presented as factory. I have seen some, but not presented as factory( not saying it could't have happened)-the 76 alloy tank was a more dull finish also.
Given the propensity of Maico to use whatever parts up, it is difficult if not impossible to dispute this bike as a very late 75 model( think of a very early 76). Still, I think the alloy tank has been polished and painted. If I were really really cashed up, it would be nice to collect-but I think Wombat's 326 is waaay cooler personally.