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The Mecha Arm was obtainable in Season 8: "Looking to the Future" by reaching level 5.
Mecha Arm already has an insanely low copy count of around ~5.9K, paired with its insanely low MU count of around ~61, as well as it being hoarded, it's no surprise that its an extremely rare item to spot in trading. It's similar in rarity compared to other extremely rare items, such as Afterburner, Endurance Wing or Spider Leg.
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Largest holder · 78% of circulation