You're right Mike. First off, that's not the data sheet for that particular brand of socket, it was the best I could find for you, but it's a pretty good representation of how a socket like that is made.

The gold portion is obvious on the internal contact area. That data sheet says 30 micron thick plating which is pretty standard from what I have read looking into gold plating thicknesses in general.



The exterior plating according to that data sheet is either gold (which it doesn't look at all like), pure tin 200 microns thick, or a tin lead combination 200 microns thick.

Like you said it really doesn't matter, it will be a gold connector when you sell it. Looking into was just for fun.