I don't really understand the purpose of the Vintage A head. Well that's not true, I know that it's a way to make Remo more money.
When Remo first made a plastic head (1958), the first version out the door was 10.5 mil, and was NOT popular. There was no way you could convince most drummers of the time to use anything but calf.
Remo then developed a thinner version, called the Ambassador, which is 10 mil thick, and the even thinner Diplomat, which was 7 mil. Over the next couple of years, drummers made a gradual transition to these plastic heads, figuring that their convenience and consistency out weighed the gorgeous sound yet major pain in the butt of calf skin. Ambassador and Diplomat heads became the "sound" of the 60's, as well as other heads like the Ludwig Weathermaster, which is basically a copy of the Diplomat.
So, what Remo is trying to resell as the "Vintage" sound is actually just a reproduction of the first plastic head that DIDN'T catch on. If you really want that vintage sound, go with an Ambassador or Diplomat head, or even better, a NOS used head from your company of choice.