I have recently bought six small 6 oz tumblers on eBay. They look like 1920-30's in style, hand made in clear glass with transfers of two young boxers in "Dennis the Menace" style cartoon drawings colour transfers, wearing shorts and large gloves slogging it out. The tumblers have two thin lines around the base which is quite chunky with two ridges, hence the line marking. They are very charming!
I would have added a photo, but a friend married to a famous boxing promotor saw them squealed with delight, and pursuaded me to part with them as a Xmas present for hubby!
Does this ring any bells ?
I MIGHT pursuade her to let me take a photo if this might help!