Ronin/Warlord bottlecaps by Warlord-of-Noodles (DeviantArt)

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Eight of the Armor's crests as bottlecaps. (Strata/Tenku is missing)

Source: Ronin/Warlord bottlecaps by Warlord-of-Noodles (DeviantArt)

It looks like she’ll sell you one upon request. See her DeviantArt submission for more details.