While looking for more pictures of the Sabamobile I found this website https://www.cassetterecorder-museum.com/en/en.html Skimming through what was surprising is how many other manufacturers had the idea of putting two reels in a plastic cartridge before Philips came up with the definite method (at least until Sony decided the world needed Elcaset for Hi Fi).
That's a classic website, looks like it's for sale? I just saw my Magnovox Mono, looks like it was originally a Philips, he has it listed as the 664. I wonder why guys like this don't come out of the woodwork more, maybe visit the forums once in a while? My buddy here in town was the same, so much information and experience but he rarely poked around the forums.