http://www.rockislandauction.com/viewitem/aid/67/lid/1369

The pinfire system was a popular type of early self-contained metallic cartridge in Europe, but didn't find much use in the United States. Pinfire revolvers were made in a variety of calibers from 5mm up to 15mm, and a much smaller number of revolving rifle and carbines were also made. This particular revolving rifle is a 6-shot, 15mm model with a folding bayonet - made in Belgium for a reseller by the name of Juan Lopez in Buenos Aires.