Notice that the top four reeds are on a separate plate. My guess is that the other reed plates are from a 32 key model, with the small plate added to reach 36.
Here, M-36 Blue (A?) on the bottom, my other newer M-36 (B?) on the top. Notice the differences in the reed plates. Also, notice in earlier photo that the M-36 Blue has a bladder, which is intact and in good condition.