This one is a 5-screw; that upper side plate screw was eliminated in 1955. So the youngest it could be is 1954-55. K-Frame .22 LRs were introduced in 1931, so that is its maximum age. The 1st model K22s were made from 1931 to 1940, and the seller has marked this as a "3rd Model", so my guess is this gun was made between 1940 and 1955. More knowledgable folks than me can probably narrow it down closer without the serial number.
Now, if you want a really wild guess...
S&Ws of that time period used right-hand threads on the ejector rod, and it is easy for the ejector rod to back out a tad and lock the gun up. The scars on the cylinder look like the gun was clamped in a vise at some time, maybe to secure those right-hand threads tightly and avoid lockups. The extractor rod threads were changed from right-hand to left-hand in 1961 or thereabouts, so more recent guns don't have that problem.
I would buy the gun if it were between $400-500, but that offer would probably insult the gun store owner.