I'd try to save it

. Not really...
Seriously, I've been thinking about the color on the Plumb handles. It is called "mahogany" and red, etc. Minwax makes a tinted polyurethane finish called polyshades that has some close variants, and that seems to be the type of finish on most of the Plumbs I've seen. I've used it to tint finish on longrifles, mixed with spar varnish and oil to make it more elastic. Cut with thinner, it makes a wiping varnish that builds a color coat fairly quickly. Just an idea for somebody trying to replicate the finish on an Plumb with a new handle. I know I've seen Permabond kits, also, but no idea if they still make them.