Vintage / antique Houzex slag glass outlet footed lamp base marble swirl 1920's or 1930

Vintage / antique Houzex slag glass footed lamp base marble swirl 1920's or 1930's.
Beautiful swirl pattern and has a "footed" bottom.
Has a "scratch" on bottom that looks like it was made that way ( from manufactures) and a similar one on top ( see photo with finger pointing to it) - don't know if it was made that way or become that way through use /age ??
This is JUST A LAMP BASE that may be used for an antique lamp part.
Colors in photos may appear slightly different because of photography lighting and phone/computer screens, etc outlet