I live in the German zip code area 92363 if you check it on google earth that will show it up well.
I also have a single percussion duelling pistol by Johann Adam of Regensburg in like new condition I guess it was in a peaceable mans ownership, it must have been made between 1794-1869 I would tend to the latter as it is percussion.
Did you do Oktoberfest when you were here?
Martin