Really hard to tell from the pictures, but it appears that there may be pin fire groves under the hammers. Looks to be Spanish made , if pinfire, mid to late 1800's. if cartridge it could even be recent. These are very popular in South America and are still being made there there, usually in .320 caliber. Carried by the poor working folks against the many bandits. Some of the recent ones don't even have rifling ( it is a close range firearm. One version , in 22 LR was sold in the US but they were not popular and I've even forgoten who imported them and from where. Not a high dollar item.