I have been some-what fortunate, and have managed to obtain a lamp-base, designed by Frantisek Vizner.
Vizner designed this item for Skrdlovice glassworks, early in 1968. It was made by glass-master Frantisek Spinar, and is a scarce/uncommon lamp-base variant of pattern number 6860/25.
The colour means this is contemporary, not recent production. This is a pink over very pale blue sommerso, which appears a very faint green where it contacts the pink. I have been absolutely stunned by the virtuosity of the glass-maker.
This item initially caused some concern, as there is no documentary evidence, easily available, to show that Skrdlovice/Beranek have made lamp-bases. Certainly, I worried, and was concerned that some-one had done an amateur conversion of a vase. In the end, I spoke to Vlastimil Beranek, of Beranek Glassworks, Skrdlovice, who very kindly confirmed that the lamp-base was a genuine item, though the company had not made many, and also had not been in production for many years.
The height is 26cms (@10") and is 9cms square (just under 4" square)
Wieghs in at over 3kg (6.5lbs)
The lamp-base is unsigned.
This has been very difficult to photograph and do justice to.
Images of this can be found here:http://glassgallery.yobunny.org.uk/thumbnails.php?album=59
(Thanks again, Anne, for the facility)
I hope you enjoy the images.