I do hope that this is the right place for this...

I got my first doll about two months ago at a con from a doll clothes seller who happened to have a couple of extra/spare dolls that she was willing to sell. But because I didn't go through an official seller/site, I've got limited information about him. I know what model his head is, what company he's from, and his size, but that's about it. What I want[/b ]to know about him, is if he has one of the newer double jointed bodies or not.

So my question is... how do I tell a double jointed msd boy body from a regularly jointed one?