I see lots of these around, they come in different heights, at first I thought they were 50's/60's Nuutajarvi as they produced some very similar pieces in a similar smokey green colour and the quality is good, but I'm now pretty sure most are new/newish. If it is'nt signed my best guess is that they're being made in Poland and sold widely in the UK.
I may be wrong...
Martyn.