What a very cool piece of medical equipment. This is the spittoon bowl that was used in a Dental office. It measures nearly 12" across and is 3.5" deep. It has a 1.5" hole in the bottom and is made out of 3/8" very heavy glass. I would guess it to be from the 1920's or 1930's due to the composition of the cast/chrome ring. It is in SUPER condition.