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What a beauty, measures 2" tall, 5" top rim outside edge diameter. The glass has high lead content, weighs 2.5 pounds, rings when tapped. I am wondering if this ashtray was made by the American Brilliant Period cut glass company Hawkes, due to the ashtray having hand cut vertical bars all around the sides, see pics, which is a design Hawkes did on ashtrays as shown in the 1920s-30s Hawkes ad, see pic. But this ashtray was almost certainly made post-1960 because it does not glow like vaseline glass in blacklight- see pics with the ashtray and a circa 1905 ABP cut glass sugar (in another listing, might also be Hawkes). The great majority of clear/colorless American glassware made pre-1960 glows like this. Was the Hawkes company still in business post 1960? I have not found out yet.
There is only 1 small flake on the factory ground and polished wide flat top rim edge, but the flake is directly in line with one of the vertical hand cut bars, so most likely this flake is a minor manufacturing flaw that occurred at the time of cutting, and is only noticeable if you hold the ashtray at just the right angle to a light source and examine, otherwise not noticeable. The ashtray base is factory ground flat and left unpolished for friction stability, see pic.