Will customers buy a bowling ball not knowing exactly what they will get? The bowling world is about to find out with Ebonite International’s Sept. 20 launch of the MISSION UNKNOWN balls that will be sold in an intriguing new way. Will it be a marketing and sales bonanza? Or a flop? Since to my knowledge nothing like it has been tried before, it’s impossible to predict.   The company has produced 8,000 MISSION UNKNOWNS for public sale consisting of 7,120 black solids, 800...