are four (4) Mint Jabo ULTRA FURNACE TANK WASH marbles made at Jabo, Inc., Reno, Ohio, June 3, 2009. Many thanks to Dave McCullough, Plant Manager, and his capable crew, along with the Jabo Joker team, for an outstanding production of marbles. Just before a new run begins, the tank is washed out by producing marbles using the glass that remains in the tank from the last run plus a few additional selected colors. These wash out runs produce a very limited number of marbles and often produce some outstanding results. are four extra nice marbles with outstanding designs and color combinations. See these very special 5/8+/-" gems. Each marble has been carefully chosen for beauty and condition. Winning bidder sends payment for bid + $2.00 USPS First Class Mail fee. Thanks for looking.