Constantine that is totally normal and looks great as in looks to be normal/low wear. Every classic P series pistol I own shows that shiny metal at exactly the same spots on top of the frame after the first range trip or so and then it does not progress any more. I just keep a light coat of grease there. Same goes for that shiny area on top of the locking insert.
Here is a picture that shows what areas on the topside of my P226 frame that I lube with a light coat of grease and this is in addition the the frame rails of the side, that take the most abuse, and the exterior of the barrel.
