Welcome to Quilting Board.
I wonder if it was a Select-o-matic as seen in this video - https://www.youtube.com/watch?v=tLCn203rQt0
According to the manual found at https://archive.org/details/select-o...ge/18/mode/2up it has some built in decorative stitches.
There is another pink Atlas that is a little different from the above one, but not much info about the machine itself at Pink Atlas--can you identify ?
There were a couple of Atlas machines that have decorative stitches, but are on Pinterest. Both are from ebay, so no longer able to be found on ebay.
https://www.pinterest.com/pin/vtg-se...9627751461691/ and
https://www.pinterest.com/pin/vintag...8258071141813/
Good luck on your search.
Janey - Neat people never make the exciting discoveries I do.
Not affiliated with off-site link(s)
ETA Sorry, I replied before I read your response so ignore the grayed out.