Hi, Scot.
You know, it's very true that a finish can make ALL the difference insofar as value of a vintage drum. Some people who collect these things, don't even drum. They just collect "Beatle-iana". It's what is called a "cross-collectible". And, because of that, it opens up a new category of bidders. Literally, ANY drum from the 60's in Oyster Black Pearl will fetch above-average prices.
On the other hand, a "common" finish can also be desirable. If I have a mint-condition blue sparkle bass drum, matching toms/floor toms and original hardware...but I don't have a blue sparkle snare drum to complete the kit the way I want to complete it...I don't want to use a Supra...and then, all of a sudden a minty blue sparkle snare drum comes up for bid...I am going to try to get that blue sparkle snare drum. Maybe someone else also has the same idea. How badly do I want that drum? How much am I willing to pay? How long have I been waiting for that kind of drum? All those questions must be taken into consideration.
I'll tell ya what...there is an auction on EBay right now for a completely faded Gretsch 18" bass drum and it looks like the hole for the tom mount is waaay too large to be original (I could be wrong). No hoops, t-rods or claws are included...The seams are lifted....In other words, it's not in the greatest of shape (certainly not "mint") and, yet, it has already been bid to over $1000.00! WHY? Because: Gretsch name + vintage era 18" bass drum = rarely-available = highly desirable