Do not get this confused with other models named "Princess". There's a basic white based 32 oz. lamp called this as well as an old vintage wall sconce model that used the Consort globe.

Thanks goes out to Jeff Goo who found this great pic. ~martina goo

New Info!
"I have been told by Mathmos that this is a Princess, and was made in the 1970s. The lamp's owner, when emailed during the auction (I was planning on buying it, but the shipping was too costly and risky) said she bought it at a trade show in the USA in 1979, and that it had been the center of the Crestworth Trading Ltd. (Mathmos) booth, surrounded by many regular lava lamps. Apparently it had stood in the same living room for years, had been sent back to Crestworth twice (they refilled it to match the room's colors), and it was now the original color again. Mathmos does not now do refilling. I wish I could have bought it! It looks remarkably similar to the Imperial giant lamp from Lava Corp's 1966-67 line, which was a production model."
~ Jonas Goo