It's my understanding that Brother produced many Atlas machines post-WWII for marketing in the U.S. Maybe you'd have better luck finding a match by searching for photos of Brother models from the 1960/70s?
For instance, would this be closer to what you remember? (Brother ZU2-B687 Pacesetter:
Source Link)
Edited to add:
I found a Reddit thread that might be helpful:
https://www.reddit.com/r/sewing/comments/je69ez/anyone_have_info_on_this_machine/
