These Pyrex bowls came in a set of 2 in the Hot-N-Cold Chip and Dip set. Although exact production dates are unknown, it is thought to be made some time in the 1950s. Unofficially called "Eyes", these bowls are farely scarce. Bowl sizes 401 and 403 were made, and only come with the "Eyes" on the white bowl. A gold version exists, but is too rare to list.