I know of one pen restorer who uses Cherry Blossom Liquid shoe Polish, then buffed by hand and left for 24 hours followed by a spray coat of sealant, a car product that detailers are using instead of wax.
I thought that you may like to see an example of a well worn and well loved Sheaffer, you would want to leave that surface just as it is.
If that Sheaffer were mine and the wear due to countless extended writing sessions I would absolutely love it just the way it is, as I'm sure you do. My equivalent pen is a Parker 45 flighter I've been using for nearly 40 years and it barely shows any marks at all. Yours looks way better!