GM open element air cleaner with a chrome base?

[3macs1]

Hi Eric:
I am not much help either other than I took an air cleaner identical to that off a unaltered small block 72 corvette probally 25 years ago.Like you I thought the base was not GM but now after seeing yours I am not sure. I know I still have the lid with the GM marking , wing nut and the chrome tube somewhere but think I tossed the bottom thinking it was not GM. The more I compare that base you posted to a black GM one the more I think it is GM just a matter did someone chrome it or did the factory do it.
take care
Joe