I have heard stories about the printing at Charlton; Supposedly, they bought an old color press from a breakfast cereal company. The publisher seems to have been built around providing content to feed the presses and keep them working and profitable, and toward that end, Charlton produced comics, magazines including Hit Parader, and miscellaneous stuff like coloring books.
I have seen Charlton comic with terrible printing. Lots of off-register color, and smeared ink. Off-square page trimming. Off-square or misplaced binding folds. Someone on this forum recently reported finding two different comics with wrong covers.
But I have also seen a few Charlton books with beautiful printing. Sometimes even better than what Marvel and DC were producing at the time.
Was this unevenness the result of equipment going without proper maintenance for long periods, followed by a complete overhaul resulting in good printing for a time? Or did the presses finally become unusable, forcing Charlton to go completely against their business model and contract the printing to another printer?