Is there 'honest' wear on the bottom, or does the piece look in perfect condition? There is some very limited production of this type of glass coming out of the Czech Republic right now. The cutting does not look delicate enough to be Val St. Lambert, which is the most famous company to do two-color glass, with vaseline glass as the underlayer. Some company in Czechoslovakia (before Czech Republic was born) was in competition with Val St. Lambert and made some nice glass. The glass that is coming out of the Czech Republic now is also nice glass. I don't know what company made the stuff in the 1920's, but I do know who contracted with the various artisans in the Czech Republic to make the current glass. It is not made by a particular factory. Instead, these two glass dealers/collectors arranged for 5 different glass masters to each do the particular step they were best at, and the pieces were shipped from glass worker to glass worker to end up with a finished product. I have a goblet and vase, both with a blue outer layer and vaseline under-layer. I have not seen this shape come from those sellers, but they have had a few shapes I did not know belonged to them until I saw who the ebay seller was. They are up front about it that it is modern glass. The glass is not a 'reproduction', as it is all done from blanks they have had created and then cut. They also have them made with a red outer layer and vaseline inner layer. Due to the popularity of the vaseline glass as it is today, all that have been made have an inner layer of vaseline glass. They are all unsigned. My service provider must be doing some work right now on their equipment, cuz I can't seem to upload pics right now. Check for surface wear on the bottom. Also, when you list this piece, please let me know! my email is davepeterson >at< icnet.net (just take out the >at< and put in a @ sign. thanks!
oh, regarding the glow after you took it away from the UV. I see it is sitting near a table lamp. that can make the green show up more. also, camera flash can do it too. vaseline glass does not continue to glow after removal of the UV source. you cannot 'charge' up a piece and then remove the light and expect it to keep glowing. put the light on it for as long as you like...then take it into a closet with no external light. it won't glow.