Wow. That is one unique revolver, one of a kind for sure. Did you run the serial number to see when it was made? I see several inspector's marks.
There's a B on the side of the frame and maybe on the cylinder, and the C and possibly a T under the grips. And another mark under the trigger guard.
That's an amazing find.
So, in 1946, someone engraved an original...cool.
http://proofhouse.com/cm/us_inspector.htm
check this out: 1946 - 1980
http://www.remingtonsociety.com/rsa/journals/engraved