Did we ever get an answer to where this paperweight was made? I have an almost identical one with the words GLASSHOUSE 1987 WHO170427 on the base and an almost identical signature. It also, when you look at it carefully, has a large letter G impressed on the base.
I think they will turn out to be the Seattle GLASSHOUSE Studio, who identify their paperweights with notations like WRA which stands for Weight Round Abstract and WSF - Weight Single Flower. WHO is going to stand for something like Weight something something, and FLT on Roy's original one was probably Flat something something.
I have written to ask the studio if this is one of there's, but maybe somebody here can help.