so the Berger gun makes it also into the new world http://www.gunbroker.com/Auction/ViewItem.aspx?Item=530603418

I doubt - "Very rare gun from a rarely seen maker." - it was made in New Orleans. J.F.(Johann Friedrich ?)Dittrich was probably a german gunmaker who came to New Orleans and import german guns to sell it there.
proably came into the states between the american civil war and 1867-1870 when the Chassepot rubber opturation was adopted for berger needle fire guns.
again beautyful damascus barrels

SN 1003 on the butt plate

wood is not bad

this 14 ga is a real needle fire shotgun with the old school long dirt chamber which slide into the barrels