This looks identical to the one on page 84 of Miller's Collecting Glass (Yates), which is signed. I only noticed it because today I saw what I think might be 2 of the ones below, but in black not orange, and was wondering how much it was worth paying for them.
If you wouldn't mind saying how much yours was - the book price £120-150 - it would give me a comparison. Completely understand if you'd prefer not to post that info though.
Kind regards
Cat