I have one, I bought it from an antique dealer a few years back for a twenty dollar bill. Guy thought it was just a paper wieght. All brass, double barrel, double hammers 1 trigger. smooth bore .36 cal. pull both hammers back and pull the trigger 1 barrel fires then the other. If you pull the hammer back real qiuck they almost fire at the same time. Or pull 1 hammer back then you fire it, and save the 2nd shot for later. It's called a snakes-eye pistol. After just a bit of cleaning mine works perfectly.