Beautiful used rack, and boy are they hard to find., straight and unbent good quality plating. No rust anywhere top or bottom, just a few small spots that started to oxidize and have turned black. Clearly marked CL175K3, and I matched it up against a 1970 CL175K3 that I have in the garage and it is a perfect fit on the shocks, and fits under the tail light.
I will not guarantee that it will fit all 1970-1973 CL175 models but I believe the frames are the same.
This rack does not say "AAA brand", but I have seen enough to know that this was built by AAA which was the defacto standard aftermarket brand that Honda dealers sold their customers when a rack was wanted.