All Model HD Military pistols fall between serial #150,000 and #173,000 . Any number outside that range is either a different High Standard model (e.g., Sport King, Supermatic) or a forgery.
Approximately 2,600 Model HD units (serial range 114,000–117,000) were produced with integral suppressors for clandestine operations by the OSS. histandard model hd military serial numbers best
, was used by the OSS (precursor to the CIA) and famously carried by pilot during the 1960 U-2 spy plane incident. All Model HD Military pistols fall between serial