The barrel profile of yours appears to be a K-38 Heavy Masterpiece . . . which, in a standard catalogued 6" barrel length, went on to become the Model 14.

Here is a special ordered factory 5" K-38 Masterpiece with the narrow rib and tapered barrel profile which . . . in a standard cataloged 4" barrel length . . . went on to become the Model 15.



Russ