Topps Unique was a unique card line (pun intended). To my knowledge it didn't offer anything special that hadn't been done before. It would have been a great idea if Topps released a whole line of cards showing players in alternate uniforms like the 1st card in this post which was a subset called Unique Unis.
Instead all the base cards were a lot like what you see above. These "base" cards were all numbered, mine being 487/1199.
The above two cards are my latest Andrew McCutchen additions.