Interesting!
In the December 2017 Rock Island Auction were a number of guns from the same provenance:
Property of a German Prince, great, great grandchild of Emperor Franz Josef I, Emperor of Austria and King of Hungary.
https://www.rockislandauction.com/detail...ver-combinationhttps://www.rockislandauction.com/detail...-sporting-riflehttps://www.rockislandauction.com/detail/72/3290/very-rare-and-highly-unusual-german-double-barreledhttps://www.rockislandauction.com/detail...l-greiss-hingedhttps://www.rockislandauction.com/detail...n-gallery-riflehttps://www.rockislandauction.com/detail...-sporting-rifleI may have missed some in the listing, and there were some more guns in the following April 2018 auction.
Per description no monograms or other hints to the owner.
All high quality, but not excessively ornate, “working guns” of a wealthy hunter.
All made (or sourced through) well-known Munich gunsmiths, such as Miller & Greis.
But this one hints to its owner Leopold von Bayern
https://www.rockislandauction.com/detail...-service-musketfuhrmann