There aren't many American cards I don't know about. I don't mean I've memorized my 2008 Standard Catalog of Baseball Cards from cover to cover, and I can't tell you how many cards were in the 1952 Topps set, and honestly the 1990 Donruss set just has way too many meaningless variations. But I know how to find information about sets, cards, and players pretty easily using the multitude of resources available to me. (And I have at least flipped through every page of the Beckett Almanac I bought back in 2003.)
Japan is a different question. You must think I'm a broken record when I talk about this, and it's definitely become a cliché on this blog. But even for modern sets issued by major manufacturer BBM, there just is no comprehensive guide out there. So I was a little surprised to see this card pop up on Yahoo Japan Auctions:
This card features a piece of cloth cut from a t-shirt she wore inside a gymnasium. I'm pretty sure she just wore it for the photo, though it comes from the university where she used to teach. It is identified as a "practice shirt", but how often do gymnasts practice routines in t-shirts? Perhaps it was worn during workouts or warm-ups.
The card itself is from the 2012 BBM Real Venus set, but wasn't included in packs. Instead, it is a "Fuji Television Limited" card. I have no clue how it was distributed, nor have I tried to find out. I know there was at least one other year where promotional memorabilia cards were issued. I should note that Real Venus has no memorabilia cards in the regular packs.
This card is numbered 112/200, and has card number RVM-R. There is a patch version numbered out of 20 copies, using the logo found on the front. It is possible there are more promo relic cards out there that I don't know about. But if there are, I don't know about them.
Did I make you laugh?
This isn't my first Rie Tanaka relic card, nor my first Tanaka shirt relic card. The 2013 box set included several relics, and I've found a black shirt, a blue shirt, and a leotard from that issue. There's also a towel and another leotard relic I'm on the lookout for.