I am not a Charlton expert. I don't know a lot about their history (although I bet it is probably interesting), or even have a lot of their books.
When I was a kid, every used book store invariably had a small pile of comics and they were almost always beat up Charltons.
Every antique shop and thrift shop had a small stack of comics sitting on an old table and there were always Charltons in the pile.
Almost every collection I buy has at least 1 or 2 Charlton. No matter how tattered and tor