I have a vintage friodur 5/8s with caramel plastic scales that had the twins logo and the word friodur on them, and it that came in a very old and ratty yellow friodur box with green lettering. It's a wonderful basic razor and I'm trying to figure out where it fits in the friodur universe so I can get it a sibling, but don't want to accidentally buy something very different.

So there are these old friodurs with caramel scales with twins and "friodur" and often yellow boxes.

I've also seen friodurs with that kind of scale [old style caramel with twins and the word friodur] in much newer looking red friodur boxes. Are those just more recent vintage models, or is henckels making these new again?

And I've seen a couple with interesting yellow/back checkerboard designs on the blade, but still with the vintage caramel scales with twins/friodur on them.

And then there are the innumerable monster NOS Friodur 7/8, 8/8 with decorated spines and dramatic points, which always seem to come in custom scales or mismatched non-henckels scales from other German makers. Are these really friodur blades, are they friodur blanks redone by Herr Wacker or someone like him, and why are they so much bigger than what appear to be the vintage ones?