Hi Nige, put it in the cabinet at Salt's I will be over there at my daughters Christmas Eve. Interesting as it does seem to have a green tint, did the meadow(uncatalogued) have the same longer unfinished neck? and base.
Could quite easily be an experimental piece someone playing around with colours or the heating/cooling process caused the anomaly and maybe sneaked it out the back door intending to turn it into a lamp I never say never with glass at the end of the day it's only the whim of the maker how it turns out and oddities do turn up from time too time.
Still think it's a kingfisher gone wrong though
Think what you need is an 'expert'