Groucho Marx - Ashtray - Wondering about Glass Maker and Year Please

This cigar ashtray is really neat, bought it at an estate sale amongst some other beautiful things, it is no longer mine (a very cool story behind this). At first I thought Grouch was applied via sticker in this ashtray, the more I looked at it, I realized this was a fused process. The cigar ashtray has the standard 4 rests, it is squared, with a textured feel to it. It measures 8 3/4" X 8 3/4" and is ice blue in color. I am curious to know if anyone knows the FOR SURE date of manufacturing and who the maker was and what origin. Since Groucho Marx spanned many decades, I am a bit perplexed. It certainly has the look and feel of ashtrays made anywhere between the 1930's (late) and 1970's. I would appreciate any info on this so I can provide to the new owner. FUN story that goes with this - more to come =) Thanks