I now have the Kew pix for Reg. 881198 - plus some others - and hope to post all of them over the next 48 hours. But, in the meantime, and if Claire is still looking, will she tell us please if her clear glass/plastic 'snow globe' is in some way threaded. I'm asking this as the black base carries a very simple form of thread, and so we have to assume that whatever was intended originally to sit atop the base also carried a matching thread.
The Kew Registration data for this item indicates that the base might be suitable for several items, but none of these is for a 'snow globe' - although that's not to say categoricaly the Registrant didn't subsequently invent a globe for the base. My opinion would be that if the globe isn't threaded then it's unlikely to be part of the original design.