Hello Kevin
Here's one that Left the factory on July 1947. It has the larger style Mushroom shaped extractor rod. They used this style extractor to exhaust the Prewar supply of them, having to Mill out the bottom of the barrel to allow the closing of the cylinder. it is considered a Transitional K-22 and it's serial is a low Four digit sequence....The Smaller style Magna stock's shown in the last Two Picture's are serial numbered to it being original when it left the factory in 1947. The General.