The Twisted Optic pattern on this set of six green sherbets, Imperial's #313 Line, is a pretty counterclockwise spiral twist in the glass. It was made between 1927 and into the 1930s. One of the higher quality glass companies, Imperial Glass produced their green color in a richer, more jewel-like tone than the typical green of this era.
Each of these green glass sherbets measures 4 inches in diameter across the top, and 2-3/4 inches at the base. Each is 3-1/4 inches tall.
There are no chips or cracks.