osiris01, thanks for the information about my new old GBD. It arrived today. The surprise is that what looked to be oxidized Vulcanite was actually orific-style horn, and in quite nice condition. I have to believe some refurbishment has already been performed. I tidied up the rim, polished the mouthpiece, and gave it a coat of wax, but it took all of ten minutes.
Also remarkable is that the oval shank and mouthpiece are in perfect alignment. No shims needed to prevent overrotation. The stummel is in great shape, too. One unusual feature is a small "11" stamped in the center of the front of the bowl. I'll post photos tomorrow.