Size is ~9"/23 cm - exterior has a satin/etched finish. There are bubble inclusions throughout. I would estimate the thickness of the wall at the neck at about 3/16"/4 mm. The bottom has no pontil mark, the center is recessed, and there's a fair amount of wear (can see it pretty well in the photo), which is my only real indication that it's not recent production. The rim is ground and polished.
I've concluded it is not US-made, and am guessing it's European, which is not my strong suit - I'm hoping someone here can ID or at least give me some suggestions of manufacturers to look into.