The buyer of the '58 said my photos didn't do it justice, especially in regards to the grips.
So here are some pics of the grips on the '59. They appear to made of a much denser, straight-grained walnut, more burgundy in color. The finish is smooth as glass. They look shinier than they are due to the lighting. Also, the color match from side to side is perfect (see the right grip for true color). I can't seem to get the lighting right on a left grip photo.
Again, this gun is as close to 100% as one could reasonably expect to find after 54 years. From someone's sock drawer to my safe to your hands...