A little of both, The Dealer tags are mine that I saved over the years. They are aluminum, I riveted those onto the steel tags which I buy at auctions when possible. Here in NC they have gotten more valuable also, we set up at a big swap meet in Charlotte once a year and for a nice tag I can get $20.00 each all day long for stuff out of the 70's.
Older dates and mint tags just go up from there. At auction if they leave them in large lots like 10 or more you can usually buy them for less than $10.00 each.