The tapping plate and ADBV look very Fram.
The plastic center tube sounds very Champion (and perhaps some M+H)
Wire backed media sounds Fram or Champion.
Inking looks Champion-ish...
I was thinking the same thing.
Fram looking Baseplate, Champ looking e-core and date code.
... (did M+H acquire CL?)
Have not heard anything about that, but who knows.
I know there have been low production filters outsourced to other makers in the past, but still does not explain the Frampion appearance of this filter.