A pair of recents projects I just started:
The easy one, a 6306 with a cool patina, I'm waiting for it to start its trip from Japan. If I'm lucky it mostly a case of choosing a crystal, mineral or sapphire. Not too worried about servicing it. I tend to prefer faded blue bezels on those, and as those bezels were well made not many are ghosted like this. Scratched into oblivion sure, but faded not so much. It may look nice paired with the right strap...
The not so easy one. Also mostly a crystal problem as it works OK but in this case I am not aware of any aftermarket crystal...
I could probably put a standard flat mineral instead but I would lose the bevel and I think it won't look great. I'm putting together from scraps a H-link Citizen bracelet for it too.