Looks like a K-22 Combat Masterpiece (pre Model 18) to me, and it looks very nice, at least what I can see of it. Your serial number falls into the range listed in the SCSW as 1953, and I think I see these, without the original box or papers, going for $500 - $600 at the local shows in the high condition your revolver appears to be in. That is a very nice Smith.
I should mention that demand and prices vary by region, and you might check the acution sites for past sales.
Hi, I new Here and am wanting to get a guote for insuring my K-22. the S/N is k 68xxx. I belive it was make in 1948. some ware on the cylender on the locking notches, and barrel tip from a hoster. Thanks for the help.