You guys have good eyes. The easiest spot to check on the seams will be in the boot area. My car had that done, but I had documentation that the seams were brought down to bare metal before filling and painting. It is not ideal because of body flexing, but the car was so nice and I figured I would address it during the "next" restoration. Don't let that deter you if you are convinced that you are not dealing with a lot of rust underneath. If you are planning on restoring the car, then you are ready to go.
Oh boy, another 4A will be getting back on the road!