I have bottoms up glasses and in the ashtray part it is marked with a R inside of what loohs like a sort of a crown. I cannot find anything on this mark. Could you please help! They come in all colors Thanks

Roger Pearce
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I have a bottoms up glass(women & man) on the coaster/ashtray there is Letter R within what looks to be a crown. Would be interested in who the maker is but have not been able to find out. Thsnk you in advamce