I agree, appear to be aggies. Here's a marble website for your viewing pleasure. http://www.marblealan.com/FAQ.htm The site has had some problems recently and is trying to rebuild, so it may not have all the sections ready yet. Still, something to bookmark maybe.
ever looked on e-pay for what some marbles are going for? its amazing these guys can date these things and figure out where they have been made. dont just toss'em in the drawer, research them!