After searching APUG for discussions on the subject: Plus-X from Kodak i found only some words from Thomas Bertilson on a few rolls he fucked up in pyro.
Today this film is sold in 135 and 120. Its branded 125PX on the flm rebate. This has changed from earlier emulsions. Yesterday i bought 4 boxes of Plus-X Pan in 4x5" (PXP) dated 1999. I attached a picture of what one off my test sheets looked like.
I hope other people also like this great film from Kodak, and maybe have som "trivia" on it to share.