can anyone tell me some info on a A.GRESVIO DIAMONT OSLO.i went on line but could not find any history of the bike in english.

Are you sure its not Diamant?

Gresvig ASA is a company which owns a sporting goods chain called "G Sport" which in turn I believe owns the "Diamant" brand. It probably wasn't built in Norway, but imported. Is it an old one? Post some pictures please, and we can probably tell you more about it.

They did build their own bikes in Oslo, Norway up until the mid fifties. after that I think they were made in Sweden. Now of course they are made in the far east. Here's a thread about mine. (I now know they made bikes in Norway)
https://www.bikeforums.net/showthread...hlight=diamant