The Crimson Key - 1947 was released on:
USA: 2 July 1947
The Crimson Key - 1947 is rated/received certificates of: USA:Approved (PCA #12344)
To craft a Crimson Key in Terraria, you need to combine 1 Crimson Key Mold, which can be obtained by defeating enemies in the Crimson biome, with 3 of each type of soul: Soul of Night and Soul of Light, at a Mythril or Orichalcum Anvil. You'll also need to be in Hardmode to craft the key. Once crafted, the Crimson Key can be used to unlock the Crimson Chest found in the Dungeon, allowing you to access exclusive loot.
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Key - 2011 I was released on: USA: 23 October 2012
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The Key to Power - 1920 was released on: USA: January 1920
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The Key of Awesome - 2009 was released on: USA: 19 October 2009
Key Exchange - 1985 was released on: USA: 14 August 1985