The info you have is possibily correct up to the Regiment, but I think the rest is wrong.
This type of coding system was only used by the army and was introduced by a regulation dated Sept 10, 1940. Prior to that, on Sept 1, 1937, they introduced a system that used the name of the commander to hide the real identity, but this system collapsed when commanders got killed one after another. Anyway, the 1940 code system works like the Feldpost Number system the Germans used and when families wrote to the soldiers in the field this is the address they put on. So after the war, families only had these codes as a clue to try to locate missing husbands, fathers. The Ministry of Welfare, whatever they call themselves now held the full list and helped families trace those missing.
The kanji prefix (in your case Kaki) was given to divisions and all components of that division shared that prefix. So for the 16th Div it went as follows.
Kaki 6551 Reg HQ
Kaki 6554 9th Inft Regt
Kaki 6555 20th Inft Regt (as you see 6555 is the Regiment Number)
Kaki 6556 33rd Inft Regt
Kaki 6557 16th Recon Regt
Kaki 6558 22nd Field Art Regt
Kaki 6560 16th Pioneer Regt
Now, according to the order of battle for late 1937, the 20th Regt consisted of 3 Battalions, with 4 Inft companies each, and though each had a MG company, there simply wasn't as many as 25 companies, so the interpretation of 25 in your example does not make sense to me. The 2nd Battalion did hold the 5th Company, so I thought that may be the answer, but if we apply it to the first tag it doesn't explain the 17, as the 7th company was also in the 2nd battalion.
The short answer is that, at the moment I also don't know how the code worked after the Regiment number.
This type of coding system was only used by the army and was introduced by a regulation dated Sept 10, 1940. Prior to that, on Sept 1, 1937, they introduced a system that used the name of the commander to hide the real identity, but this system collapsed when commanders got killed one after another. Anyway, the 1940 code system works like the Feldpost Number system the Germans used and when families wrote to the soldiers in the field this is the address they put on. So after the war, families only had these codes as a clue to try to locate missing husbands, fathers. The Ministry of Welfare, whatever they call themselves now held the full list and helped families trace those missing.
The kanji prefix (in your case Kaki) was given to divisions and all components of that division shared that prefix. So for the 16th Div it went as follows.
Kaki 6551 Reg HQ
Kaki 6554 9th Inft Regt
Kaki 6555 20th Inft Regt (as you see 6555 is the Regiment Number)
Kaki 6556 33rd Inft Regt
Kaki 6557 16th Recon Regt
Kaki 6558 22nd Field Art Regt
Kaki 6560 16th Pioneer Regt
Now, according to the order of battle for late 1937, the 20th Regt consisted of 3 Battalions, with 4 Inft companies each, and though each had a MG company, there simply wasn't as many as 25 companies, so the interpretation of 25 in your example does not make sense to me. The 2nd Battalion did hold the 5th Company, so I thought that may be the answer, but if we apply it to the first tag it doesn't explain the 17, as the 7th company was also in the 2nd battalion.
The short answer is that, at the moment I also don't know how the code worked after the Regiment number.
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