Paragrafrytterklubben -- Principia appreciation

doesn't wear on the anodising like that suggest over tensioned spokes?

No, they all do that sir. It's because the wall of the rim is thin and the shape is poorly designed to transfer spoke tension to the tyre bed, so it bulges and dips as the spoke tension tries to pull it out of shape. It's typical on pretty much all tubular rims which were made from a squashed round drawn tube rather than being extruded to their final shape.