Thanks for the great information. I’ll get out my magnifying glass and advise.Nice find on the Model 12, @billtool . The Model 12 has different frame dimensions that any other K frame S&W. Regular K frame grips will go on but they won't fit right. The Model 12 frame is machined narrower and there will be a gap between the frame and the grips. Also, look for a crack in the frame near where the model number is stamped inside the crane. This is the weak spot on the Airweight.
Still, a nice old Airweight gun and I just know it will be a good shooter.