I will tell you all now, that I have advised Max not to sell this item.
This is from an extremely scarce range of production from Crystalex/Exbor, just prior to Exbor -Egermann going its own way.
This is a stunningly high quality piece of glass, in production terms being as rare as the proverbial rocking-horse pooh....
These very small series, signed items, are of the highest quality, and should you be fortunate enough to find one, are "pension fund" items.
Max, enjoy, and when the time comes, sell to go on a holiday, enjoy a leisurely retirement.
Wonderful, that you have shared this with us.