Earl S. Tupper began experimenting with plastics in 1938 and by 1945 had produced his first tumbler. Tupperware Home Parties was formed in 1951 to sell products through dealers using a party plan. Here is a wonderful Tupperware jell-o mold. It is in excellent condition showing only the lightest indications of use. There are no cracks or stains. The mold measures 9 1/2” in diameter and it holds six cups. . All three pieces are marked “Tupperware”.