That shell should clean up nice, I hope for you.
I have a Clubdate kit that has 2 drums with red and 2 with black same July 7 1965 dates on all.
My Shells look like Mahogany inner and Maple outer plys.
Yours might be the other way around.
Just to add to the confusion.
Nice job on cleanup, looking good.
I have used Cape Cod polishing cloths but really liked the way a Tumbler cleaned up Nickle I had with less hand rubbing.
Soaked in Dawn over night then dried and threw them in tumbler.