The large covered area looks like glue and the suspected die chip looks like a drop of that same substance. Give it an acetone soak in a covered container.
Also expect your post to get relocated - It will end up in the 'modern error' area. (I requested it to get moved to the proper area for better attention to your coin.
Not a good idea to scrub coins with a toothbrush. Do not clean modern coins unless you know what you are doing is a general rule. Acetone does not work on all adhesives, like epoxy for example. John1
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