Picked up a strange piece. 6" height, 2 1/2" diameter, Opaline. Compared it to a couple of PV opaline pieces I have & color seems to match. Unfortunately I cannot get a decent pic of the polished pontil of the bottom that is recessed exactly like a PV cologne I have. Ground botton ring surrounding pontil shows alot of wear. Would this be some type of hot chocolate cup? Thanks