Howdy
Generally speaking, I see K-22s going for $1200-$1500.
Bear in mind, there were three separate versions of the K-22. The K-22 Outdoorsman was introduced in 1931. This is a typical K-22 Outdoorsman, it shipped in 1935. Notice the correct Service Grips, the lack of a barrel rib, the long throw hammer, and the two tiny windage adjustment screws for the rear sight. I paid $1200 for it a number of years ago.
The 'Pre-War' K-22 Masterpiece was only made from 1940 until 1941 when S&W concentrated on war time production of the 38 'Victory' Model. There were only slightly more than 1000 made, so they will command a premium price. This model still lacked a barrel rib, but the rear sight was replaced with the modern Micrometer Click rear sight and it had the then new short throw hammer.
After the War, K-22 Masterpiece production picked up again with the 'Postwar Model' also sometimes known as the Pre-Model 17. Produced from 1946 until 1957 when the changeover was made to model numbers rather than model names. This model featured a barrel rib, short throw hammer, anti backlash trigger, and of course the Micrometer Click rear sight. Notice the correct Magna grips on this one. It shipped in 1950, it is almost pristine, just a little bit of muzzle wear and wear to the blue on the high spots of the cylinder. Regarding the minimal amount of cylinder ring on this revolver; it is almost impossible to avoid getting a cylinder ring on a S&W revolver if the cylinder has been opened and closed much over the years. Notice the hammer is different on this K-22 Masterpiece than the hammer on the OP's K-22 Masterpiece. That one has the slightly earlier 'speed hammer' an early version of the short throw hammer.
I paid $850 for this one a few years ago. I doubt I could touch it for that much today.
From what I can see in his photos, the only downside to the OP's K-22 Masterpiece are the incorrect grips. There is still plenty of color on the case hardened hammer and trigger. Muzzle wear seems to be less than on my K-22 Masterpiece, wear to the high points of the cylinder about the same. Yes, the cylinder ring is quite prominent, but the revolver is over 70 years old. I would ask for $1000 and see if it sells for that price.