(http://glassgallery.yobunny.org.uk/albums/userpics/10318/normal_DSCF1862.jpg) (http://glassgallery.yobunny.org.uk/albums/userpics/10318/DSCF1862.jpg) (http://glassgallery.yobunny.org.uk/albums/userpics/10318/normal_DSCF1870.jpg) (http://glassgallery.yobunny.org.uk/albums/userpics/10318/DSCF1870.jpg)
Click either image to enlarge.
Height 17¾" (45cm), weight (including plaster of paris filler) 2lb 4½oz (1042g).
It looks very Silber & Fleming to me, so I checked their reprinted catalogue with no success. I can't recall ever seeing anything like this before.
The image on the right is rather spoiled by my neighbour using the bathroom at the crucial moment. I hadn't noticed until I started work on this topic. I have floated a tea-light on water in the container, and added two tea-light lanterns, one behind my lamp to shine light through the flake cut to clear knop in the stem. A close-up of the stem is available here (http://glassgallery.yobunny.org.uk/displayimage.php?pos=-20579), click the main image to enlarge.
(http://glassgallery.yobunny.org.uk/albums/userpics/10318/normal_IMG_6127-2.jpg) (http://glassgallery.yobunny.org.uk/albums/userpics/10318/IMG_6127-2.jpg) (http://glassgallery.yobunny.org.uk/albums/userpics/10318/normal_IMG_6126-2.jpg) (http://glassgallery.yobunny.org.uk/albums/userpics/10318/IMG_6126-2.jpg)
Click either image to enlarge.
Searching the internet I found this example, height approximately 10" (25cm), bought in New England and being sold by friendly and helpful ebay seller wahoo-mercantile (http://www.ebay.co.uk/itm/120764912961). Note the very similar metalwork, probably by the same factory as mine, suggesting a significant international operation. The experienced seller has suggested that oil is added to holders with a floating wick. Please respect the seller's copyright of these images. I sought and have permission to use them here only.
Enlightenment and relevant ideas welcomed.
Thanks for your interest,
Bernard C. 8)