Some may already have seen this. I found it a few days ago and found it helpful. I used it to follow the abbreviations to the Ammo maker on the labels of WWII Germanboxes.
There are other codes in it so I'll also attach the Home page. Hope it helps someone else.
https://oldmilitarymarkings.com/code...alpha_a-b.html
https://oldmilitarymarkings.com/codes_full.html
https://oldmilitarymarkings.com/codes_full_numeric.html