Because the eBay item will not remain in view, I have added a photo of another of these "stange items" below so we can hang on to this post for future reference. In a meeting of the Cambridge Paperweight Circle, September 2003, Bob Hall showed the item I have pictured below (*). A panel of members in an ID clinic could not identify it or suggest a purpose. I confirmed that the canes were early Ysart (and I suspect these items were made in the Ysart Brothers years, but could have been pre-war Moncrieff). I also suggested the function of "candle holder" and later Bob tried this out and said it worked very well.
In the eBay listing, an eBay member comment was posted which doubted the idea of a candle holder on the grounds that dripping wax would obscure the decoration. But "Pin Dishes" and "Ash Trays" with millefiori bases would have the same "obscuring" problem when in use. I do not think that the Ysart men would have been too concerned about wax running down the weight section of a "candle holder". If the owner wanted to see the decoration then the item could be cleaned up to whatever degree suited.
However, I would be interested to hear of other ideas for the use of these rather unsual "saucer weights".
(*) Edited for correction - the one shown below is not the one I originally saw. Please read on for correct information.