... It is amazing how much confusion gets into folklore via glassmakers. There is an assumption that because they knew the person that they know everything they make. PY was shown a pic of one of these years ago and said nothing to do with his family. Lots of this goes on in Scotland. I recall a lamp sold on eBay last year which looked like very much Vasart but eventually Kevin on studying the canes thought it could be Perthshire Paperweights. The original dealer asked a friend who had worked at Perthshire and he stated "No way Perthshire - none of the colours were used at PP". However, the buyer took it to Chic Young "Oh yes, I made that (At Perthshire Paperweights) it was a one of trial and Stuart Drysdale did not approve it for production". He signed the lampbase.
Chic Young trained under Paul Ysart after WWII at Moncrieff's.
If you look at how it is made you will find a lot of differences between it and any Ysart glass. The only similarity is that this uses some silver flakes (Ysart's used Mica - but I believe other materials can be used) and has stripes. Colours do not usually match those used by the Ysart's but then they did use a lot of colours from various suppliers in Europe and UK.
However, I would still love to know where these were made. I have seen only one vase in this technique but about 6 lamp-bases. Which makes it fairly rare and 1930-50's seems a reasonable date range. USA or Bohemia are still equal hot favourites.