Not based on the kick drum height referenced to Pete's, Roger's knees, nor to Roger's relatively short stature unless it's much further to the rear than I think it is, making it too short for an A7 and too tall for whatever an 816/511 combo is, so no clue since by '68 everybody and his brother were making variations of the A7 plus shortening real ones became popular to increase driver loading to handle the new high power drivers, amps.
Can't tell about the horn, my ancient CRT is so blurry/dark it's just a black blob even blown up full screen.









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