Nice stone. I had my eye on it but ....... $ tight. Anyway, I've had a few of those in past years. One large one like that with a label on the stone and no box, another couple with label and paper box. Never with the fitted wooden box, so I would bet yours is older.

I would suggest shooting a PM to Hatzicho with a link to this thread. He knows Thuringan area geology and stones as few do. If anyone could tell you something about the history of the Hohenzollern stones I would bet he could.