Comment by han enderman:
OK 8641 - labels added: #1 orig. black label (long reg. legend below OK logo); #2 same, but red label; #3 black with short reg. legend (only A-side available); #4 red with license statement at 10 (A-side, mediocre image). - Good images of both sides of type #4 are on
discogs. Apparently type #3 is rare. Type #2 is odd here, as the red label of this type is used in the 8000 series for OK 8589-8611, and with 8612 the black label starts. So probably remaining red label stock was used here (and I have seen no other use of this type in this series after 8611)..