Reasonable, although it would make more sense if they were made out of steel or iron.
One thing mitigating in favor of these being more or less trivial (amulets) is that AFAIK there’s no surviving description of their production or use for any kind of purpose at all. :^)
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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