I've no idea about this at all. I don't mind when it was made as I bought it out of curiosity - I like this design of glass and the colour and iridescence made it a bit different (although I can't stand the new frilly small bowl and cinderella carriage type stuff in clear

)
I really can't pin it down to anything new or old. I've not found anything at all to match, although I have found recent clear 'variations' on a theme but they are zig zag at the top and have no final straight 'rim'.
I know the following:
- Steuben did a variation including 'lattice/trellis work' - sure it's not Steuben though is it? did they do this iridescence and colour?
- I'm pretty sure I recently found a Holmegaard version 19th century somewhere but cannot find the link again unfortunately - they were in clear and I don't think it's them but maybe Scandinavian perhaps?
- Thomas Webb patented a zig zag basket 7" high and straighter sides than this, sort of like an upright straight sided ice bucket type shape, with glass liner, in 1901
- Boulton and Mills patented a rim that consisted of this type of zig zag ( wondering if Jinxi's 'pear' bowl on this thread (link below) might be Boulton and Mills perhaps?)
http://www.glassmessages.com/index.php/topic,36683.msg199874.html#msg199874- There are new variations on this theme some blue and clear, some clear, but I've not found any this shape so far, and none in this colour and iridescent finish. That's not to say they don't exist being jobbed out somewhere though.
My bowl:
- The glass rings but it's not overtly heavy, probably normal for size, not light either.
- Everything about it is in excellent condition, apart from heavy wear around three fairly longish areas around the base rim,which I was quite surprised to see as I'd been expecting it to be brand new for some reason.
- It has a fair amount of accumulated dust and dirt but nothing that wouldn't accumulate over a few years I guess.
- It's slightly iridescent purples and oranges, but no surface texture.
- Big at 10" wide by 3 3/4" high
- All handmade
- The base and pontil mark are very indented, however the pontil mark looks as though the pontil rod had five or six 'grips' on it as it's left little marks around the pontil mark circle rather than it being snapped off leaving a straight line or a round snapped off mark. Might this indicate a newer type of pontil rod maybe?
My first thought was a museum replica, but a replica of what? I've not found any very old a Traforato pieces in anything other than clear and very few references for those.
My second thought was that perhaps it might be an Art Nouveau era piece when iridescence was at it's height?
I have searched extensively on this one, on the net, in all my books etc, and absolutely nothing. So any help or ideas very much appreciated.
Thanks

m