Nutshell Summary for non-Nerds
What I found very interesting in reading the 1886 accounting rules was that each Regiment had its own team of seamsters and they made the uniforms out of bolts of cloth supplied by the government, copying the design sample also supplied by the government. Furthermore each regiment took measurements of its own men to arrive at mean values to set up its own regimental standard sizes of Small, Medium and Large. So these sizes could be different from regiment to regiment.
When the marking photo in post 8 said 6th Infantry Regiment, it therefore also meant they were the manufacturer of the uniform.
The marking system was established to give some uniformity to this system of each regiment doing their own thing.
Then the Tokyo clothing depot was established in 1890 and Hiroshima in 1907. This was necessary to prevent the regiments from staying home to sew uniforms instead of fighting the Sino-Japanese war of 1894/95 and the Russo-Japanese War of 1904/05.
These depots including Osaka, gradually took over the job of making uniforms, but much of the marking regulation had remained unchanged until the regiments started to complain in the 1920s that they were soldiers and were not working for a clothing factory!
This is the story behind the A stamp in a nutshell.
A historical perspective has a lot more to offer, doesn't it ?
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