After about 1954, there was one other distinction between the K38 Masterpiece (later the Model 14) and the .38 Combat Masterpiece (later the Model 15). In addition to the barrel length, the K-38 had a straight barrel, while the Combat Masterpiece retained the original tapered barrel. This remained true until c. 1982, when the Model 14 was discontinued.
Throughout the years when both were made, the Combat Masterpiece normally had the Baughman "Quick Draw" ramped front sight, while the Masterpiece normally had the Patridge target sight. The Model 15 was not available with the 2" barrel until about 1964 (Model 15-2).