I am new to the site, and S&W pistols. I just acquired a mod.37 airweight, ser#J59529 for $350, was this a good price, and can anyone give me a date of manufacture? It has original grips, and appears to be in great condition, I would guess 95%, only one very small area of blueing being rubbed off. What is the difference between this model and the "dash" models, mine has no dash.