5061xx is waay too high for a pre WW II N
Your revolver does appear to be a 2nd Model .44 Special Target. The front sight could be a replacement. The 4th model .44 targets were built on the post WW II short action and had a rib on the barrel.
The caliber rollmark is a bit tough to read on my monitor, but this sure looks more like a M&P Target than a .44 HE 2nd.
Larry