Not seen a yellow one,how many colours did they do?
Just adding to this thread as I have a little more to offer (missed it first time around).
A yellow one is unusual, so was this opaque or clear, M?
But of the colours I know of:OPAQUE
Green (Keith, if your other green one isn't uranium, this is probably later)
Clear (flint)MATTHEY CRINKLES
Yellow crinkles onto clear
Apart from these there are many variations to the embossing on the base: Parker; Chance; Fibreglass; With Compliments of Chance (plus others). I also have two examples where the top ring is embossed. Additionally, there are some with transfers affixed and a few that are (ahem) tetradecagon (OK, that's 14-sided
) in a translucent blue. These appear in this thread
A very deep-amber, which borders on being ruby. It also has a slightly different base, so could have been an early trial glass mix.
A clear glass one that's been engraved!
More will be revealed when the second book's released.