"Okay, my non-expert opinion, based upon some time reviewing the Standard Catalog, is you may have a M50 (also sometime marked as a M36 or M36-1), possibly one of the relatively rare nickel finished pre-50s."
Sorry, not a chance. Look at the cylinder flutes. You can see three of them. That means it's a 6-shot.
Southpaw,
Open the cylinder, and look in the crane cut, the flat area right under the forcing cone. The model number and serial number may be stamped or engraved there.