I completely agree with mbmb, you have a "Oslo" sandblasted designed bowl by Arne Jon Jutrem, of Hadeland Glass.I suspect the year would be 1959, but I would stand to be corrected by mbmb, on that. For those who collect Hadeland glass it would be a most welcome piece to their collection.
And by the way its "Scandimad" and not Scandimaid, but I suppose my wife could be referred to as a Scandimaid as she ends up doing most of the dusting of my collection. Although I do insist that I do any washing necessary.