Thanks guys. To answer some of the questions posed - yes, the two seams are on the 18" FT. Seller says all badges are the same and all say Chicago and have no serial numbers, except for the snare which does have a serial number. Waiting to get that. You would think if he tells me it has a serial number he would give it to me at the same time, but whatever.
So what I'm hearing is that the kit probably isn't a matched from the factory kit and is probably not pre-serial, but it should still be late 60's to mid 70's vintage, which I'm fine with. Is that a fair statement??
And to Vibes - yes, I've priced a new Ludwig Classic (7-ply) and Legacy (3-ply with re-rings) and the costs are astronomical. Over $4k and $5k, respectively. JUST THE 14" TOM in a 3-ply is $900! So this is what I don't understand - how can vintage 3-ply drums be only worth $500 if it costs $5k to buy new ones? I have recently seen two identical snares on ebay and craiglsist for $225+. Based on those two pieces of information, seems like they would be worth much more than $500.
Thanks again for sharing all the knowledge!