And actually, silly for me not to having spotted it last night, but at 5.5" dia my piece is much larger (and with four trails, not three), so perhaps it was never intended to come with the stand. Is it still a salt, and if not, what is it?
Frank, I'm not surprised that Andrew Lineham would have a good pedigree, looking through that site. He's posted some original Frederick Carder drawings.
Thanks everyone!
Cathy