Wait a minute! Is that a model marked 3 1/2-inch N-Frame .357 Magnum or is it actually a "pre" Model 27? It's a five-screw gun and has the prominent twin pins securing the sight base. Gotta be a pre-1957 example. I have a crabbier looking one from around 1954-55. I've not "lettered" it yet. Shown with a Colt 3 5 7 from about the same time period. Oh, and an IWC about the same age as the revolvers.