this thread was startet to look for early needle fire Berger double guns beside of Dreyse which was the very first hammerless breech loader in 1856. but now I have again a very early needle fire gun with a Teschner Collath like design.
engraved "L. H. Bösenberg in Leipzig 1857" this very short double gun must be a very quick response to the Dreyse gun coming from Suhl.
gun is property of the military museum in Prague http://www.vhu.cz/cenny-exemplar-ve-sbirkach-vhu-lovecka-dvojka-predovka-s-jehlovym-udernikem/

in all it looks more like a muzzle loader but having similaritys with the Sturm and "Speckhahn " gun above