I'll add a piece:
In 1940 the 2nd Model, the K22/40 as the factory called it, was introduced but it's named the "K22 Masteriece", a milestone in the K22 story and a rare collectible because the war was its demise after a short production run.
It was the 1st S&W target model to sport the Micro click sight and the first Model to have the short throw hammer action or High Speed Action as the factory advertised it. It did not have a barrel rib but was the first K22 Masterpiece. Collectors call it the K22 2nd Model-1st Model Masterpiece.
The post war re-introduction was the "K22 Masterpiece" or 2nd model Masterpiece to collectors, which had a rib, the new post war sliding bar hammer block safety still used today, and the post war version Micro click sight with grooved tang, no longer flush with the top strap.
K22 Outdoorsman introduced in 1931:
Pre 1935 Outdoorsman pre war sight with only one elevation screw. The K22 Outdoorsman post 1935 has the improved sight with an added elevation lock screw (not shown), 2nd issue or 2nd version is not correct nomenclature because the gun itself was unchanged so don't be confused if you read that:
Pre war K22 Masterpiece 1940:
Sight is unique in that it's milled flush with the top strap like all pre war target sights, but is the very 1st version of the Micro click. This was the first model supplied with the new larger 1st version sight adjustment tool (S.A.T.) that has become so familiar post war:
More threads to read:
Is this a K-22 OD 2nd Model aka K-22/40
A Couple of Pre-War 22-40 Masterpieces
http://smith-wessonforum.com/s-w-han...come-home.html
K-22/40 found with long action, info for database
Hope this helps,