Here's a card that's been on my radar for over a year now. I have the OPC base and retro, I've always just needed the retro black border and blank back parallels. The black border is numbered to 100 and I've seen a handful of them online, but the blank back is a different story. I've only seen one or two, and these have been out for two years now.
Here's the front of the card, which is the exact same as the regular retro parallel.
Here's the back of the card:
This one I would put down as another eBay steal, as I got it for far less than I ever thought I would. Supposedly, there are only 5 copies of this card in existence, but without official confirmation of the print runs from Upper Deck, who knows?
What do you guys think, are blank backs worth any kind of premium, especially when it comes to player collections? Even if there are more like 20 of each card, that's still pretty rare all things considered, so I'll definitely take it for around $5 delivered.