the colour and bubbles reminded me of wfrs. type, although I am unable to find anything under the search heading. Not remotely like the smaller ashtrays that are definitely attributable to that source, and this is really quite a large beast at something like 8.5 inches in diameter. Quality manufacture, and the centre is quite remarkable for the way that the underside is in fact hollow up into the central 'bulb' (which has a 'flat' on the top). Plenty of wear on the underside, and apart from that, the piece is in very good condition. Looks as though it may be 30 - 50 years of age.
Help needed please, and thanks for looking. Sorry, not an easy piece to photograph showing all of the design etc. Paul S.