This yellow vaseline glass Ivy ball is a true uranium formula that glows under black light. The pattern is Early American Hobnail. This is one of the best examples that I have ever seen for even opalescence in this line. The piece is in absolutely perfect condition without any manufacturing flaws as is often seen with older glass. It measures 6 inches tall. Because of the quality, this piece is often mistaken for Fenton glass. Bright and beautiful! Sadly, Imperial closed in 1984 so there are no more of their wares to be had.