Adding a cyclops / date magnifier on a new watch?
You can add a magnifier to the crystal.
The outside can be polished, carefully, but make sure it isn't plated, and don't get the polishing compound everywhere. I'd use jeweler's rouge and a soft cloth. Don't do too much, the patina is part of the watch.
If it keeps time well, I think no need to service the movement.
The Seiko and Citizen Forum is where all knowledge about vintage Seikos resides. They will want clearer photos, though.
http://www.thewatchsite.com