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The 147 rim is obtainable from the Tier 2 Safe (costing 16k per safe) with a 10% chance of dropping.
Supply is widely distributed — no single holder owns enough to register as a hoarder.
This item is from the 16k safe, considering the fact its an ultra rare, having it at 25k makes perfect sense since you're not guaranteed to get it, its also similar to the other rewards, which are also 25k.