The following information comes from the personal archive of Pape & Kellner.
Johann Reiger in Munich was a Master Gun Smith who manufactured and sold Hunting weapons. He made a percussion double shotgun with safeties for Ludwig II circa 1855 and a Percussion Double rifle for Prince Luipold? about the same time. In 1868 he is recorded as being at the Vienna University of Applied Sciences in 1868. Eugene Heer’s book Der Neue Stockel gives his dates of operation as 1843 to 1855.
Recently the Rock Island Auction Co. sold a similar 16 ga. shotgun by reiger for $748. and pictures are following.
On 05/07/2020 Cowan’s Auction Co. sold a cased set of 7mm percussion pistols for $5,400. and images follow.