This tube of six Mercury brand table tennis or ping pong balls is from the 1930s. The label states they were officially approved by the U.S.T.T.A. (United States Table Tennis Association) and produced according to their specifications. The balls are in excellent condition with no damage, each still retaining the blue ink logo. The original paper insert is still present in the tube. The cardboard tube has very slight edge wear but is in excellent condition given its 80 year age.