Blown three-mold glass
Glass Dictionary

Glassware made in America between about 1815 and 1835 that was blown in a fullsize mold that (despite the popular name) consisted of between two and five pieces.
Artwork Examples:
Glassware made in America between about 1815 and 1835 that was blown in a fullsize mold that (despite the popular name) consisted of between two and five pieces.