Slowakische Kassettensite mit allen Einlegern

[EZ647]

I assumed the Forward contained different tapes, I'll have to compare the ones at Philips with each other to form conclusions.
But for the budget models, they may not have bothered to list the sources of manufacture, which FX undoubtedly is just budget.
Some Forward JVC/Victor/Konica have very light to red ferro tape, some very dark, some almost black, it's quite a mystery, but who made black ferro tape and why, apart from Maxell and Agfa Magnetite?

You can see many photos of Forward tape at these links if that's not too much of a hindrance:
Victor RZ 60
https://vintagehifi.sk/viewtopic.php?p=36950#p36950
https://vintagehifi.sk/viewtopic.php?p=36833#p36833
Philips CD Plus
https://vintagehifi.sk/viewtopic.php?p=25937#p25937
Konica XRI 120
https://vintagehifi.sk/viewtopic.php?p=31847#p31847
Victor RZ 120
https://vintagehifi.sk/viewtopic.php?p=34149#p34149
Teac CDX 100
https://vintagehifi.sk/viewtopic.php?p=36069#p36069

I also have a period Panasonic EP Forward and that is also fine
https://ez647.sk/cc/panasonic_ep.html


I noticed the MusicBox one on that prerecorded cassette, but I've found many prerecorded cassettes with designs that match the Tudor cassettes, for example, which is interesting.
For example:
https://ez647.sk/cc/orig_i/b/tkffmlovrthu.jpg
https://ez647.sk/cc/rozne/b/tudor_hf90c.jpg
but when I compare it directly, I guess there are differences after all, they are just similar

Regards EZ