Whatever work was done on this gun is July 1943 at the factory was done by the Service Dep't. The Army was overseeing the handgun production line making Victory Models, however the Service Dep't still functioned under S&Ws management, repairing S&Ws., etc. Your gun was one of them and the invoice for the work done is probably in the archives at the Springfield History Museum, filed under the name of the person who sent in the gun, and describes what work was done in July 1943. It's possible the factory did the gun smithing to create this snubby for a particular customer ( except for the stocks ) as S&W would usually do anything you wanted to pay for. Drop by the archives at the Museum, dig out the box that says" July 1943 " and tell us what you discover. Ed.