Alum slot rim id??

That is a Ansen brand wheel. Ansen did not put their name on all of their wheels.
I have some Ansens marked the same as your wheel. Gardena Calf. and the washer relief is your give away clues. Never understood why they didn't put their name on all of them.
Most other brands such as Fenton, Western, ET, Cragar and Superior are marked better with
a cast in name and size.
The Appliance wheels had very deep recessed lug holes more like some modern
factory wheels with the leaning or lazy A mark as mentioned already.
There are other wheels that are not marked also but they have Made in Japan cast into them.
I always figured these came out of the JC Whitney or similar catalog's and were the cheaper
imported knock offs.