Is it a real "Superman", what defines that for you? Is it lineaged back to that original piece that was dubbed the "superman" or is it an AC version that flooded the stores after the popularity of the coral. Is superman just a red polyped, blue coral then?
For 56 bucks that isn't a bad deal per se, but since lineage is a matter of trust then you should obtain such pieces only from reputable dealers or those whom you trust......no one can tell from ebay or online sources....which I would never participate in on pieces I am really wanting. Being there and inspecting the piece and the character of the person is paramount in my opinion. That is what RC is for, build that network for the future....this way it also builds your rep. in the community for future transactions. It also is a way to document where it came from.
However DNA does not lie, and the real piece in contact with another "real" superman will grow together. I had an AC version of the Superman, and it was alright.....grew crazy fast and was only bright blue in the high light.
I have the "real" one now and it is on the bottom of the tank....just as baby blue as it can be.
So......my guess.....its AC, but I don't know for sure and perhaps this is a reputable seller.....but I have seen my fair share on not on ebay.....I guess if it matters to you......check it out first and get to know the person and check them out within the reefing community. If you looking for a lineaged, real deal superman......then find and buy one from someone/where you know and can trust. Thats how I have always done it in the past.
Believe it or not, building relationships and networking is half of being in this hobby......build one with a dealer you can trust and respect.....this is what I have done. Don't worry about the cash so much as putting a down payment on mutual trust and respect, don't try to always "get the best deals" or "get ahead".......and in the end you will.
So do you want the colors or the pedigree is what I would ask?