I've been researching my set of these glasses, and was surprised to find very similar examples from a number of different countries, so I thought it might be helpful to pull something together for reference. I have contacted several sellers for permission to include their photographs of labelled examples, and will add them as I get replies. So far I have found examples from Poland, Bulgaria, Romania, and Korea.
Mine are below. 10.25cm high x 3cm rim diameter, 3.5cm base diameter, weight 88g. Flat cut and polished rim, slightly concave base. Note the slight bulge towards the base. I have only found labelled examples with this feature from Korea. Pattern is Strawberries, and appears fairly well executed.
If anyone has any labelled examples, please add them. I couldn't find anything on the board about these pieces, probably because they're not really anything special, just cute little things.