Vlad - from 1952 until 1955, the U.S.S.R. made a decision to code the dates of manufacture of shell casings with a letter code. While the code is in alphabetical order by the Cyrillic Alphabet, there are gaps between some of the letters. Whether this was done to make it harder to decipher, or simply that some letters were deemed unecessarily complex for metal stamping dies for this purpose, I have no idea.
The letters, in the Latin Alphabet, and the years they represent, are as follows:
G - 1952; D - 1953; E - 1954; I - 1955; K - 1956
These date codes but with the addition of L, M, P, and R also appear on some Soviet weapons, such as the Makarov Pistol and the Stechkin, and probably others. The codes on the firearms are made difficult to decipher because the letter “D” appearing on a Makarov with a frame-style that is late 1954 and after makes it impossible that it represents 1953 as it is known to on ammunition. I have found three different explanations for the firearms codes in unofficial Russian sources along, one of which I consider without merit. Until the letter “D” showed up on a Makarov, I felt the codes were the same as ammo one but extending the date range alphabetically to
1960, but the appearance of the letter “D” on a gun that could not possibly represent the year 1953, as it does on ammo, through the entire subject into a dither.