Agfa Isopan Feinkorn type 127

Agfa Isopan F Fine Grain or Feinkorn film had a speed of 17 DIN (40 ASA). According to Wiki, this film was produced from early 40s to 70s. In my copy of Agfa's How to become an ace photographer published after 1959 the speed of Isopan F is given as 21 DIN (100 ASA) so apparently the emulsion of Isopan F was revised during the production years. The backing paper on this roll has the markings "58 085" that could be production year and batch number but this is just a rough guess.

Regardless of how old this film actually is it preserved remarkably well.