At that time the Model 60 featured a 1.875" barrel and was chambered solely for the .38 Special. Like the Model 36 (Model 50), S&W produced a limited-production version with adjustable sights, the Model 60-1 Chief's Special Target.
At that point, the Model 60 had a 1.875" barrel and was limited to the .38 Special caliber. This is similar to the Model 36 (Model 50), which also featured adjustable sights in a special edition, known as the Model 60-1 Chief's Special Target.