Another copy of the signature from my site, going by the wording of the auction the seller seems to recognise it is not genuine but basically leaves it to the bidders to decide.
I suppose some people will be interested in buying is as a drawing of a signature of Paul Ysart that is also on someones paperweight. I imagine the artist had greasy, slippery fingers and used coarse emery on the base to make it easier to grip whilst signing

But seriously, can anyone identify the maker of the weight... Selkirk has been suggested...