I don't know Bruce, a hard question, I will just state that my favorites are Peltier & Alley in that order, then everything else. I like all marbles, many I have aren't worth $1.00 or $2.00 but still hold great value to me as one I got from a good friend that passed and several others as gifts. My most preciouse marble I wouldn't sell for anything I got from my Mom when I was 10. You can barely tell what it is she played it so much, an aqua slag, I think it's a pelt but I'm no absolutely sure. Not worth a plug nickel to anyone else, priceless to me. I just collect what appeals to my eye, evidently marble collectors all seem to have similar vision. Chad G.
Here's a pic of my most prized marble I got from my Mom when I was 10.