Well, I hope not to derail the good humor but I'll take a shot at a serious answer.
Short correct answer: check the VIN.
Longer answer: First, there's no description and just one poor picture, no VIN, etc. so we have to guess. Hell, I can't even see if it has the carbon Termi's that the SP would have come with. From that pic it looks like you have a 95-97 bike. There were no SP's officially brought to the US but if you have a '97 the easy way to check is if the cylinder has the "4V DOHC" cast into it like the 916 SPS does.
Honestly, I would be surprised if it's anything other than a normal 748 monoposto.