Audio Magnetics PRO 90 - Type I - ~1990
A series released for the Canadian market (maybe US as well?).
The release year for this tape could be different, probably later. This one is definitely a no-frills Low Noise tape. There is nothing impressive about this tape but it was not cheap.
Note: One was opened to take the pictures you see here. I will sell that one last. Last one available. B-Grade
About Audio Magnetics:
Audio Magnetics was a manufacturer of magnetic tape products based out of Switzerland and very little else is known about this company. Some of their 1978+ released tapes were manufactured and distributed in Portugal and possibly released in the UK and Ireland.
If you have information about this company and this "PRO" cassette, please let us know so that we may share it here with everyone.