For what it's worth, Micro-Trains released a series of N Scale Baby Ruth cars...

https://micro-trains.com/index.php?route=product/category&path=63_68_143

The source for most of their paint scheme selections was the "Billboard Refrigerator Cars" book.  Their body styles for the models are some degree of "stand in" -- the degree of stand in is of course up to the tastes of the individual modeler.

Pages 60 to 63 of the book have most of the reference photos.  Page 63 has a shot of NADX 375 which does appear to have the signature at the bottom of the tank.  My sense is that Micro-Trains has a better photo of the car than what's in the book.

George Irwin
The Unofficial Micro-Trains Release Report