Hey McDrummer, those drums will be vintage.
The Maple Custom line came out with the hopes of becoming the new 'top dog' for Yamaha, trying to push the Recording Custom off the hill. They cost more when new as compared to same size recording Custom drums. The finishes were nicer too- gold plated lugs were used on a lot of the drums. Burst finishes and awesome stain colors were available on the Maples not on the RC line (yes, I was jealous as nice as my cobalt blue is... :( ) Now the Phoenix (PHX) line is the big dog...
But, here's the rub: The Maple Customs came in specific sizes only; whereas the recording customs came in 'standard' depth as well as "power" series and "force" series, which were the deeper "metal" toms (that I loathe). [side bar- the serial number will have 9XXRC for standard toms and 9XXRF or 9XXRP for the deeper ones, with the 'XX' indicating the diameter] So, in '93 when I bought my kit, I was able to get standard depth toms when no one else offered them (other than a full custom or DW at the time). I recently learned the drums were actually manufactured between 1980 and 1989, so they were old when I bought them! Maybe they're vintage now?
You have a GREAT set of drums there, and they will get better with age, as Maple does. Enjoy them, and don't worry about if they will be classic, vintage, antique, collectible, or not...
I think what a lot of people miss about Yamaha drums is that the top drums, although beautiful to see and even more so to hear, they really are 'tools' rather than art objects. Although with the PHX and other lines these days that is not so often the case, but even their cheapest lines of drums are perfectly round, have good bearing edges and with US made heads, they sound great. That's the bottom line isn't it???:)