It is a PESCO, Police Equipment Scales Company. Made in Chicago for a brief period by two brothers names Gerstenburger. They build them in their basement in the evenings. Talked to the wife of one of the men years, maybe decades, ago. I owned three of these. I think that there might be a picture of one of these in Phil Sharps book.
The bullet feeder tube isn't original and I doubt that the paint job is either.
The first straightline progressive was the Newcomb. That design was bought out by Buchanan. Then these two guys built this one. It is this press that CH copied to make the Auto Champion. Of course the Auto Champion was copied to make the Cougar & Hunter, the Jet and the RCBS Green Machine.
Joe Dircks loaned Buchanan the money to buy the Newcomb. $1000 which back in the 30's was a lot of money. Joe, of course, went on to make the Dircks and Tri Standard straightline progressives. Someone, I don't remember who, is still making one of those two designed. Unfortunately I lost the guy's contact information when my computer died recently.
The reason CH didn't recognize it is that the current owners of CH had nothing to do with making the Auto Champion. Tony Sailer of Owen Wisconsin was the driving force behind the CH Auto Champion.