Hi Ian, no I can't find one. Just the CG and I nearly missed that, it is tilted towards the middle, and I actually saw it in the photograph rather than on the weight, then looked and found it.
Crazily, there was a label to the underside stating (from the dealer who put it into auction) that it was a 19th century Very Rare Bohemian Paperweight, with an exorbitant price tag to match! Fortunately the bright glass and lack of much wear screamed "Not on Your Nelly"...