The obelisk shown in Mike's opening post and that shown as fig. XXXII on page 112 of Slack would seem to be of the same type, even to the creamy-ivory-pale beige colour of the glass. My first photo is of example in white opaque glass.
The blue marbled glass obelisk shown in colour as photo 4 on page 82 of Thompson seems to be similar to that
of the blue marbled glass obelisk shown in my second photo. This obelisk is just over 10 inches high and has no heiroglyphs to any of its sides. I have no attribution for the manufacturer.
My third and fourth photos are of another and different pattern of obelisk, also of unattributed manufacture, this time in purple marbled glass. 8 inches high, with a distinctive scalloped edge to parts of the base and pediment, and without any heiroglyphs to the vertically ridged sides.
Fred.