I've tried to get better pictures of the signature but it is located on the glass so close to the base that it is almost impossible to see even with magnification. When I purchased this the seller did not even know it was signed. That is how difficult it is to see. Wish I could send better pictures.
After reading the previous reply I looked for examples of Ed Nesturek's work with signature and am pretty sure it is not his...but the colours are very close, however the signature is not.