I'm presuming this bowl is made from Pyrex. Its marked CORNING USA PH-7-S on the base. It has hemispherical bumps which radiate out from the centre.
I'm curious as to know what it would be used for. If its an ashtray, then it doesn't have rests. I can't imagine it being used for cooking, so what is it? There's lots of age related wear on the base. I've done a search but haven't turned anything up like this.
Can anyone tell me anything more about it please?