It's likely what we call a Greaser. Grease fills parts of the die and blocks the design transfer. There was some discussion a few months back regarding weak strike vs. Greaser. You may want to do a search to read up on both. But I believe since the rim is full that this is a Greaser.
Sometimes parts of a die can become filled with gunk or grease and that part of the design fails to be transferred to the coin. You can learn more about filled die errors here: http://www.lincolncentsonline.com/filleddie.html
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