The inscription reads Strömbergshyttan.
So it's Swedish and not Murano.
You can read more about Strömbergshyttan here:
http://www.glassmessages.com/index.php/topic,12985.0.htmlAnd by the way, it's Strömbergshyttan .....not to be confused with Studioglas Strömbergshyttan.
I mixed them up in the above thread

....... and Ivo mixed them up in his book as well.
I think it's a common mistake! And I've seen them mixed up on other forums.
-------------------------------------
I have one in a different colour.