The “no discription” might be explained as a “trade secret” kept by tradesmen/women camp followers. ICBW but I doubt chainmail was issued equipment and therefore only used by higher ranks and/or those wealthy enough to afford it and its upkeep.
Like I said earlier, just a thought.
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:^) The main problem with lack of documentation of course is, it’s surprising there’s as much as there is, but much of it must have crumbled away, or gone into the barbarian fire on a cold night. Even assuming it had been written down, it could be that none of it has survived.
In the video, an icosohedral example is shown, no holes (so, not for making glove fingers, or for ranging artillery which at first caught my interest), but those balls are still there, so, field chainmail repair is still alive. :^)