The only info I have for this disc is it's a 7" disc and the audio has "slight variations".

It seems that it could only be either RM6, RM10 or possibly RS1. RM6 is supposed to omit the bird sounds. Perhaps, that is the slight variation.


11 June 1968
E68896 4T
Blackbird (TK20-TK32)

11 June 1968
E68897 A
Blackbird (RM1-6)
RM6 is best

13 October 1968
E70410 A Z
Blackbird (RM10, RS1)