I’m not a revolver guy. However, my “gut” told me to buy it anyway. The numbers inside the yoke are 55k3957, f21 and 93557. The pistol also has marcas registradas stamped on the right side (see photo), but I don’t know if that’s pertinent. So I’m reaching out looking for answers. I hope to learn it’s age, value, etc. It will mostly be a safe queen, but it’d be nice to learn about it. Thanks