Help with SN

[Jughead]

I'm looking at a USFA Colt SAA nickel with a strange to me (limited knowledge)  SN K631. What can you tell me about it? THANKS

[GaryG]

With a K serial number, that should be a 4 3/4" Rodeo II which was done in a satin nickel.  If it's a bright nickel it was redone somewhere along the line but I don't remember any K serial numbers in a bright nickel leaving the factory.