I’m in the process of purchasing a 1972 AA-1A. The canopy operates smoothly and easily. I noticed however with it closed there seemed to be a very large gap between the back of the canopy and the turtledeck. If you look forward from the back into the area where the lock is, it seems to be at least an inch space. The front canopy and windshield seals are there and in good condition, I’m thinking it might be missing a seal at the back, either on the canopy itself or on the fuselage. I’ve looked at the parts breakdown and I think Fig 6A Index 57 is what is missing.