A 12-shot Welch Navy revolver, developed in the USA by John Walch. It was patented back in 1859.In each of the chambers of the drum there was not one charge, but two - one after the other, that is, two shots could be sequentially fired from one chamber. Each charge had a separate brand pipe. For each such brand tube, this revolver had its own separate trigger, which was actuated by a separate trigger!