The first 1,000 of these coins did not include a private key ‘pit’ on the back side, and thus a small ‘bump’ can be discerned on the hologram surface because the small round piece of paper containing the private key is placed directly between the flat metal surface and sticker. These are popularly known as ‘error coins’. This ‘structural stress’ has been documented to cause some damage to the hologram even for those that are properly stored, such as in the specimen pictured below (above the ‘L’ and below the first-bits).
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