I use terms such as "Pre-war", "Transitional" (1946-1949), "1950 Model", "Target" or "Military", proper names such as ".38/44 Heavy Duty" or "Outdoorsman", and "Model xx". Sometimes "pre-Model xx" creeps into a conversation. My .44's are "First Model" or "Triplelock", 2nd, and 3rd Model (or 1926 Model, W&K, or Transitional). Then there's "round top", "flat top", "single-line", "four-line", and various descriptions of hammers, triggers, and ejector rods. It all comes naturally but it looks confusing as I write this.