This is not something I usually look for, but it seems that most, if not all of the K38s and Model 14s I have seen have a single pin holding the Patridge sight in place. The revolvers I have seen with two pins seem to be the longer bases, such as the base used with the Baughman Ramp or Red Ramp front sight (Remember, the specs used to read "Baughman Ramp or Red Ramp on Ramp Base).