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Hey, it may come as a surprise to you, but market value for this item, as suggested by Backpack.tf (Using the item's lowest value) is 5.33 refined. Keys are currently worth 4.77-4.88 refined, making this below market value. Don't believe me? http://backpack.tf/faq scroll down to hats and level 69.
Please try to make your bid 1 scrap higher than the last