I have a friend who is interested in selling a S&W model 27 with a 3.5" barrel in blued finish. He claims the gun is in really good shape and wants $575 for it, which, if in good condition seems reasonable. The thing that has me a bit puzzled is that he says the serial number is S2488XX and I'm wondering if it is really 52488XX. He does say that the barrel is pinned. Any idea what date range this might place this gun in. I wouldn't mind having a 27 and the 3.5" barrel sounds interesting. Thanks.