Many fantastic examples of early handmade marbles are coming up for auction March 4-5, 2016, from Morphy Auctions in Denver, PA. Their online catalog is up with excellent photos and descriptions.
Of particular note to me are the many rare pottery marbles, including mochaware, sponged stoneware, American coiled stonware, and painted yellowware. There is also a rare group of painted limestone marbles (pictured here).
Register now if you want to bid online.