John Adam Heckenbach

Improvement in Breech-loading firearms
Mayville , Wi
Patent number: 91624
Issue date: Jun 22, 1869
http://www.google.com/patents?id=sf9FAAA...;q=&f=false

Improvement in Metronomes
Mayville , Wi
Patent number: 136435
Issue date: Mar 4, 1873
http://www.google.com/patents?id=HOJJAAA...;q=&f=false

Improvement in Last-Block Fastenings
Mayville , Wi
Patent number: 140038
Issue date: Jun 17, 1873
http://www.google.com/patents?id=4-JOAAA...;q=&f=false

Improvement in Breech-loading firearms
Kenosha , Wi
Patent number: 178636
Issue date: Jun 13, 1876
http://www.google.com/patents?id=s4FXAAA...;q=&f=false

One source that says he died 1879 in Milwaukee.

I believe the LJH on the barrel may be an importer's mark, as it does not correspondent to any Belgian maker's registered mark that I can find.

Where is the left firing pin?

Pete

http://www.damascus-barrels.com/Movie.html