File and Fan - Westmoreland
This pattern is seen only in this smallish (about 6 inches across) compote. The pattern is on the exterior, the iridescence on the inside. Most are ruffled. Colors include this blue opal as well as marigold and peach opal. Note the similarity to Dugan's Folding Fan.

This same File and Fan mold was used to make contemporary era miniature punch bowls.