I used to have a ridiculous 1978 Topps basketball collection: two complete high-grade PSA Sets, wax boxes, packs, trays, vending, display cases, wrappers, etc. But one thing that always eluded me was an uncut sheet, like this blank-back proof that Mastro auctioned off in December 2007.

Here's a historically significant ad TCMA placed in the April 1972 issue of The Trader Speaks—one of their first as a newly incorporated company that year.

Here's another cool item from Mastro's June 2008 Classic Collector Auction: a 1955 Exhibit Card Catalog.

Here are a pair of "1958" Topps Space Cards original artworks that Mastro offered in his June 2008 Classic Collector Auction.

It’s always amused me how hobby periodicals advertised on each other’s pages, almost like an endless loop of cross-promotion. So, I wasn’t surprised to find this Baseball Cards Magazine ad in the May 1982 issue of The Trader Speaks.

Here's one of the most gorgeous pieces of sports memorabilia: an extremely rare 1942 Rose Bowl Program for Duke vs. Oregon State, played in Durham, N.C.

How's this for a unique hobby niche, NBA Fines Documents? I apologize for the image quality; the photo in the 2002 auction catalog is tiny.