Pete, thanks for the link -- Chris and I are both researching this, but I wasn't aware of that thread. I just added to it, so now we're working on two fronts.
I have thought about sending it out for a professional appraisal, but I hate shipping firearms unless absolutely neccessary -- too many horror stories over the years. About all I trust today is insured USPS Registered Mail, and that requires a full FFL.
Hey, the Luger is here with me in the Miami/Fort Lauderdale area. Isn't there an appraiser in the frozen North who needs a visit to the Sunshine State right about now? I can arrange an inspection under blue skies and balmy breezes.