No idea, I don’t have the packaging and the back just says Customline and 1997.
Which is irrelevant, because I also have a Micro Engineering $4 and it’s frog dimensions are the same as the Atlas and Walthers. The so-called pothole exists in all three.
Using the NMRA gauge, the guardrail flangeway spacing is the same on all three. The only real difference I can see is that the Atlas guardrails are shorter than the other two.
Edit to add: According to a post by Sheldon from 2018:
“All code 83 Atlas turnouts have been built to Mark IV standards since introduced.”
It’s almost like following the same spacing standards leads to the same frog dimensions.