Sorry, the individual who has the gun has left. I will need to get back to him and will resend my request for information.
Is the gun a top break or swing out cylinder? What is the barrel length? Is it a hammerless or does it have an exposed hammer?
This is a Model 17 with an exposed hammer and a cylinder that swings out.
Smith & Wesson 22 LR, Ser #K396403
The Model 17 (K-22 Masterpiece) was introduced in 1946 as the K-22. In 1957 when S&W went to numbers to identify models, it was changed to Model 17. The finish is blued and it was offered with 4", 6", or 8 3/8" barrels. The grips are checkered walnut. It is a double action 6 shot revolver. There is a Model 17 Plus with a 10 shot cylinder that was introduced in 1996 and a Model 17 Full Lug. The barrels on this version have a full length lug. The Blue Book values are:
Add 20% to 30% to the Blue Book values for retail prices.
I hope this helps you,