by John G. Curry is considered the authoritative source for matching serial numbers to exact shipping dates.
For the most detailed records, collectors often refer to the book High Standard Firearms History 1932 to 1984 Connecticut by John G. Curry. histandard model hd military serial numbers best
On most HD Military models, the serial number is stamped on the front of the grip strap . You may also find the last three or four digits of the serial number stamped on the underside of the slide (visible when disassembled) to ensure the factory-fitted parts stayed together. What Defines the "Best" HD Military? by John G