I used KB/R14 from the mid 70's and really liked it, later the name changed form the DIN speed to the 25 asa Tingsten speed. I still have some boxes of 10x8 EFKE PL25film.

They were unique films as they were single layer very sharp but poo hardening and the slower films weren't fully Panchromatic by moder terms particularly the 25 ISO emulsion which was close3r to 50EO in daylight.

Mandle well these films gave exceptional quality.