Here I go again.....This guy brought in for me to look at, the barel is mared ZULU, There are some English and Belgium proofmarks on this gun. Didn't get into the proofmark research yet, was hoping someone may have seen this gun before....Centerfire, exposed hammer. It may have been one that was converted to shoot shootgun, some reading mentions they revised some ball guns to shoot cartridge guns at some point.

 

See attached Photos in the link below.......

 

http://s1256.photobucket.com/albums/ii499/TRAKS1/ZULU%20BARREL%20MARKING/

The action looks like that of a English Snider-Enfield rifle. Cannot explain the Zulu markings or Belgian proofs. May be a sporterized/converted military rifle that was made into a shotgun.

Snider Enfield remanned as a 24ga shotgun most likely if it is Smoothbore, if it is rifled then it is .577-450, same as the Martini-Henry

Here's some info

 

French model 1853/1867 Snider conversion. The good news is it was never fired and was only dropped once.