As suggested by others, your gun it is possibley a rare needle fire gun F.von Dreyse(Sommerda). A similar looking gun was sold by Christie,s London in a sale December 1 1998,and is pictured in the sale catalogue; lot 86.In pristine condition sold for 1725 pounds stirling. The gun was from the important vintage firearms collection of Mr,George Yannaghs.
Another needle fire gun in the same condition, by the same maker, lot 85, but of a slightly different design sold for the same price.Both of these guns had barrels that swung side-ways to facilitate loading.If the barrels on your gun swing to the side it is almost certainley a gun by made by F.von Dreyse.

Last edited by Roy Hebbes; 06/05/10 07:57 AM.
Roy Hebbes