That is a beautiful gun, for sure!

Marrakai, Is this a 20 ga on one barrel, and a 577 on the other,(A CAPE GUN) or a 20 ga necked down to .577, on both barrels?(DOUBLE RIFLE)

If it is a 20ga X .577 3" express, cape ,I have one that almost looks like a twin! Only mine is a 20 ga 2 1/2" on the left barrel, and a 58 Berdan Carbine on the right barrel. It is a jones underlever, as well, and also a back action hammer gun. The 58 Berdan musket, and 58 Berdan carbine, is an obsolete pair of black powder cartridges, the carbine being a short version of the musket! They both shot a 530 gr lead bullet at about 1100 fps for the musket, and 930 fps for the carbine version. The bullet diameter is .585. I make cases out of 577NE, and bullets are molded in a Lyman #585213 mold. It shoots well, and the shotgun side is a fine dove gun, and the rifle is hell on Moose! These to cartridges are found occasionaly, in collector shows, but rifles chambered for this cartridge, espcially the carbine version are as scarce as chicken's teeth!

This cape gun is in mint condition, and is damascus barrels, and was made for the INDIA trade, and the settlers on the Cape of Goodhope, South Africa!

If I can get someone to take some pictures with a digital camera, I'll post some pictures of it, and the cartridges it is chambered for.

I collect double rifles, cape guns, and all manner of combination guns, and have several cape guns in verious chambering combinations.