As I recall, for the .380 and .32 pistols, the change-over occurred around 1997. The 9X18 pistols changed over somewhat later; I have one made in 1998, with the round trigger guard. My suspicion is that the 9X18 pistols were primarily military-contract weapons, differing from the civilian market ones only in finishes, nomenclature stamped/roll-marked in the slide, and a lanyard loop in the butt. The 9X18s, logically then, would be the last to convert, probably using up previous parts stocks, and also to alloiw for government orders, replacement parts, etc. My understanding is that the Czech military has converted to the 75 series as thair handgun of issue-anyone else know anything about this??