I would obviously be thinking George D. to clean this pipe however because this isnāt ājust another factory pipeā but a piece of history worth a dollar or two, my 2Ā¢ would be just to have it cleaned.
I donāt mind a tasteful restoration that tops a piece or restains a stummel but on a piece like this if it were to be restored to ālike newā you no longer have the original but an exact copy of the original (which is very different).
Cleaning may leave some scars of the past such as rim darkening or dents or wear from years of handling but IMO it is desired to have those plus you keep it original, which is a bonus.
A cleaning on this pipe in and of itself is no simple task as George pointed out with the oxidation alone so it would still require and prefer professional work but it would leave the original stain and still look absolutely amazing if not better than a shiny new looking pipe.
All my opinion of course since I donāt own the pipe. I would stay away from instant pros, self proclaimed āknow it allsā, flame and toothpaste, household cleaners, Oxiclean, bleach etc āall that and skip right on over to George D. If he is willing and you are able.