: The "H" in HD stands for Hammer , indicating an external hammer instead of the internal striker found on earlier models like the Model B. Military vs. Post-War :
High Standard utilized a consecutive, multi-model serialization block system during this era. This means the histandard model hd military serial numbers best
Famously carried by U-2 pilot Francis Gary Powers when he was shot down over the Soviet Union in 1960 (Serial #120046). Serial Number Tracking : The "H" in HD stands for Hammer
126,124 – 128,116 (Transitioning to war training assets) 124 – 128