Seems like a very tricky thing to identify an accordion from a recording, since room acoustics, the microphone used, and equalization are all going to affect the way an accordion sounds.
S'b'B
Octa used to play a Crown brand which I think was made by John E Hebert. That is most likely what he used to record too. Marc Savoy thought he used an F accordion on the older record by Arhoolie.