I'd have to conclude the front panel isn't original, it must either be a duplicate of the "electric" era panel. Or was swiped from a Deluxe Reverb of that period, maybe a "parts car". Also, I've never seen an AT used in the vibrato circuit. Which makes me think that tube chart is bogus. In the photo it looks a bit too new & clean for its age. The printing looks a little odd as well. Hope that's the end of the jiggery-pokery you find in there.