Universum-Cassetten (und andere vom Versandhaus Quelle)

[Kirunavaara]

It is possible that they made such specifications, but if so, they were not effective any more from about 1981 onwards. The siver/black Universum Chromdioxid II Super, same as Permaton Chrom Super, was the first one to have a FeCo tape (dark grey, dull surface) which neither Agfa nor BASF made at that time. I don't know yet where that mystery tape comes from. And as soon as Magna and ICM supplied Universum cassettes, there were even more magnetic tape makes involved.

Regards
Martin