Do signed vintage International League balls age different than vintag ONL/OAL balls
 

I've only collected vintage signed balls that were either OAL or ONL league balls. I've stayed away from generic balls, consumer/store balls and minor league balls. I know that Autographs on more cheaply made balls fade and age quicker than OAL and ONL balls typically do, with things like exposure to lighting and storage conditions all being equal. Does anyone have any feedback as to how autographs on vintage International League balls age (specifically balls from the 1930s thru the 1950s) Do they hold up comparably to ONL and OAL balls?

I have had some beautiful PCL balls from those decades. Not sure about IL though.

Tom C