Thank you for all of that. Now that I actually know the name Im looking at, I can see the signature. Honestly they can look like something totally different until its pointed out what it actually says.
I had a look at the mambo design too. I didnt realise I could look on there for it. I looked at so much Kosta glass yesterday online. Its quite lovely. Very pure and clean..thats what the mug says to me anyway.
The fracture doesnt go to the glass, it just seems to be on the top of the handle part. No creaking. The reason I thought it was stress was because of the weight of the glass.
I'll now be researching squirrel or fox logos to see if I can find out more about it.
Its great asking on this board. You learn so much and everything seems to lead to something else. Im sure I wouldnt be so diligent if I didnt have the help. I probably wouldnt know where to start.

Trudy