Oct 10, 2020 #21 ROBBYBOBBY64 Well-Known Member Jan 11, 2020 1,496 113 New Jersey Dogo said: Is there a CB mark on the bottom? Those Clevengers can be collectibles on their own merits. The unmarked (with CB) are the ones actually blown by the Clevenger brothers. The marked ones were blown after Travis bought the glassworks. Click to expand... No mark.