When i want to see or to compare mostly i use one of your tapes which are a very good as a reference, obviously they did a great job at the factory! Not to mention Nando's Esoteric which really rocks in this regard as well.
Based on the shell design of the Akai metal I posted earlier, I guess it to be a BASF or Phillips of some kind. The shell looks very similar to that cassette you've posted.