I don't know what a "T" designation is in this situation but Kodak refers to "T" as a light source. (pub # B-#, Kodak Filters for scientific use).
There is a reference (wiki) to the original Kodachrome film as Type F available in 35mm and 828. ASA12. Also Type T125, T250 & a couple of others obviously with a specific value.
As I suggested above, since it's an older filter, call Schneider here in the US.
My money's still on a black and white contrast filter. "0" being the first digit of the catalog # which likely has remained consistant over time.
The filter in question is from B&W and at least in the assumed time of production the Agfa coding was applied by west-german industry.