Good thread. Allow me to make light. Back in the day, around 5:00 pm at the annual KRA meeting, the old masters (god rest their souls) would congregate in one of those mold-ridden rooms at Carlisle and pull out a bottle of Bourbon. The words were uttered yearly, "Tell me you've never seen a " ......" and next year, someone known to us will surface with one." To which someone else always retorted, "Show me a 1740 dated rifle and next year someone known to us will present a 1739 date."
Come to think of it, the oldest PA piece I have in my database is likely from Christian's Spring. Also, you men seem to have a grasp on the issue...where would you place the one signed Andreas Albrecht...the one that Alan Gutchess correctly restored? As for dated guns, the above thread hits the major issues.