My take on what a Vintage drum is,for American makers anyway, is the 70's,and to me, mid 70's and back Because of,
1. 1976 /77 is when the Pro market saw the Japanese product really becoming a major force,in 1977 I remember Tama superstars going for about 700.00 and change while Ludwigs were 850.00 or so,and started seeing the lower Line Imperial stars all over the place.Before that U.S. made drums were considered the best,and Sonor had not become quite the Mercedes Benz of drums yet. I also feel that anything D.W. made in the 70's or 80's as Classics.
2.For me,I have a hard time considering power tom or square size drums vintage, 12x12 etc. These American made kits I consider "Classics"
As far as Japanese drums go,I consider the Pro lines pre 1986 to be "Vintage Japanese" drums.
I guess it is all a matter of perspective, but as for a lot of sellers on E bay and such, Vintage means largest return on the dollar as far as original cost goes,the U.S. drums from the 50's and 60's are the ones that do that,and I think that is what the sellers of a "Vintage Pearl Export" Drum kit are trying to take advantage of a lot of the time.