The Victorinox Bantam II is a simple 1-layer knife with two blades.
Alox version of thos knife originally was named as Bantam, but later on it was renamed, because another version of Bantam (combo-tool instead of small blade) was released. Cellidor version, AFAIK, dodn’t had own name, only digital number.
The Victorinox Champion (type a) was a flagman of all 91-mm models before SwissChamp was released in the middle of 1980xx.
As SAKWiki mentioned, it was a very strange practice when the same name Champion was used for the different models – with corkscrew (Champion a) and Phillips screwdriver (Champion b) on the back-side. Usually models with such tools replacement got a different names (like Spartan / Tinker).
Technically it’s the same model as Ranger with corkscrew replaced by Phillips screwdriver, but Master Craftsman is much more rare knife.
As probably you know, Master Craftsman has several variations related to the Space program – Astronaut / Shuttle (Space Shuttle) models. All these models had inlaid logo of Space Shuttle on top scale.
My knife is an old one – it has old-style small blade, squared Phillips on the back and there are no hook / chisel / fine screwdriver at all.