S&W Model 1905 - special signs

My first impression is that it may be a copy of a S&W revolver, possibly made in Spain. Those with more experience will chime in.

Note that the centering of the chambers in the cylinder doesn't look precise, and that the cylinder walls of some of the chambers look rather thinner than others. This could be a safety issue.

If anything, the pattern of S&W revolver that they were copying looks like those from roughly 1899 through the early 1920's. Look at details like the front nose of the ejector rod.