You might also look for some olive ripple acrylic rod stock. You could then have one of the custom pen makers duplicate the pen for you. I've got a gorgeous Mandarin Yellow 51 that Brad Torelli did and its just a great pen. Happy Hunting.
I've seen Brad's work & OMG that boy has skills! A friend of mine picked up one of his titanium 51's. They aren't cheap, but IMHO he's the best with 51 reproductions.
Any pics?
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Tu ne cede malis sed contra audentior ito ~Yield not to misfortunes, but advance all the more boldly against them
Oh my goodness, I picked up a pen that looks exactly like this at the Dallas pen show this year!. I'll get a pic and post it as soon as I can. But from your pic it is the mate!