When I saw '4520' I was almost expecting it .. they are not exactly common! If it wasn't for the spotty dial that watch would be perfect, I think the 4520 is the king of GS movements (and the one that was used for the observatory trials) .. I much prefer it to the 4522 with date.
The 4522 I have myself also has a bit of dial damage but it is from being, at some point in its life, overoiled and them subsequently stored on its side - there is a stain on the edge of the dial where the lacquer has started to lift off. It's not extremely noticeable.
I have a pet hatred for redialled watches and would prefer an original dial with a bit of damage to a 'looks like new' redial any day - the thing is the level of workmanship on these old Grand Seiko watches is not achievable by any redialler.