Nope- not without better pics, and ALL of the markings that may be on there. It is a ball and cap revolver- if you are not familiar with that term, it uses loose black powder, lead balls (bullets) and percussion caps. Most common calibers are .36 and .44, but you are not holding the gun close enough to the computer to tell you more right now. Need close up pics, high resolution, in focus.
What we have here is... failure- to communicate.