First thing I suggested was Gullaskruf (Sweden) who made lots of handblown tableware (mugs, bottles, decanters) in the shape of both animals and humans especially in the 1940s. It is based on a tradition of such vessels in Russia and Denmark. They always
used a single colour of glass, like amber, clear or ruby.
Murano makers have always been fans of multicoloured pieces - the more the merrier. But if someone (even anon) comes along with the information that this particular decanter has been sighted with specific Murano stickers, the question will remain unsolved until someone comes up with a picture or a proper attribution from a reputable source. http://tinypic.com/esw4zp.jpg
This is the Gullaskruf pig
- it is supposed to have a cork stopper with a pierced coin in its nose.