just coming back to this as I was looking for my vase and came across a possibly interesting article.
I am pretty sure this lampshade is an old one and whilst I can't now find my reference, I did come across a bowl with this or very similar edges - can't find it again at the moment, but I think it was plain glass, same edging.
Anyway, this article (linked below) states that:
- most early pieces of overshot glass were clear,
- American overshot glass was never made with the blending of colors such as amberina and that this blending was done in England
- all of the colored overshot glass (but not the blending of colours overshot) was done in Czechoslovakia -
the source is 'Stan and Arlene Weitman article Overshot Glass'
http://www.oldandsold.com/articles/article021.shtmlSo on this basis my lampshade (blended lemon-green and clear) would be English - I'm not sure I'm totally convinced of that though.
m