Two replies for the price of one here Chris:
1. Yes, I am pretty certain it is Konst Glashyttan Urshult....I have several pieces with labels with the semi-blown interior in neodymium glass.
2. Ivo is right....get it off the window sill !!.....I have very badly scorched wooden sills as a result of placing rounded glass pieces on them....one burn is so deep it was actually smoking when I realised what was happening....if we had been away at the time.........!!!!! :phew: