Lew - No, you read my answer wrong. I said that the date codes on ammunition do NOT represent the same dates, necessarily, as those found on Makarov Pistols (and I assume other firearms, but I do not have the knowledge to address more than the PM). For example, the Cyrillic Letter “D” (I have not learned how to reproduce the Cyrillic alphabet here, although I can it in Word and Word Perfect documents) represents 1953 in ammunition. However, because of certain features found on “D”-dated Makarovs, it CANNOT represent that year on the pistol.
Jon - you are correct. The letter codes representing dates on ammo are the same at least on 7.62 x 25, 9 x 18, and 7.62 x 39. Note all the same codes necessarily exist on all those calibers though. For example, the code representing 1952 appears on 7.62 x 25, and I am sure on 7.62 x 39 as well, but does not appear on 9 x 18 mm simply because 1953 was the first year the 9 x 18 mm cartridge was serially produced, that falls within the time frame that the codes were used.