I have no answer to that.
Parker paper was already too expensive when I got started so all the Parker Bros. catalogs I have are repros. As I understand it in the "real" Clown Catalogs the pages are printed in red ink --
I concentrated my $s on A.H. Fox Gun Co. and Ithaca Gun Co. paper.
I suspect when someone wrote for a catalog, the folks in the office had a box of catalogs and a stack of current price lists, grabbed one of each, addressed the envelope and put it in the mail. I doubt those thrifty Yanks in Meriden ever threw out any catalogs when a new one got printed, just kept using them with the current price list.