Used by the Confederates. Hooray for Dixie!!
As I recall it had a 9-shot cylinder of around .42 caliber & the bottom barrel was an approximately 20 gauge shot barrel. A few were I believe also made in .36 caliber. I guess that would thus qualify it as a "Double Barrel".

I recall seeing in the past that when Lee surrendered at Appomattox that he surrendered a 10-shot revolver. Make was not given, but no one is aware of any other 10-shot revolver being used at that time, so likely was a LeMat.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra