Maxrossell: "However - and this is a big however - the extent of the weathering does suggest that some of the parts aren't original, specifically the knobs and the pickup and bridge covers. If the paint job is in that bad a shape, I would expect to see an equivalent degree of wear on the metal surfaces, and these just look far too clean. A lot of the screw heads also look suspiciously rust-free. Look at the string retainer on the headstock, and the strap buttons. That's consistent. "
What nonsense! The finish on the body has flaked somewhat because of exposure to moisture, but the pickup/bridge covers and knobs are unaffected because they're chromed. You've been looking at too many Fender relics where they wirewool the chrome parts to get an old look. But real chrome from the period remains shiny. The string retainer is rusty and faded because it's nickel plated.
Think about it for a moment. Clean chrome and faded nickel is precisely what you would expect to see on an orginal bass with this amount of wear. It's 100% right.
Johnny