These are really cool tumblers. An inner sleeve fits inside the larger outside piece. The inside piece is ribbed vertically and the outside one is ribbed on an angle to produce a diamond pattern. These glasses are in a gold flecked lavender color. The patent was pending on these ''Jaydon'' tumblers. There's a set of 5 that are in excellent condition.
Mid-century Jaydon 50's Insulated Tumbler - b42