My wife handed this to me tonight. At first, I thought, Cud! (along lower obverse rim). It is not raised like a Cud but rather, sunken in towards the rim. Thoughts.
Well first off I wouldn't call it a Cud because the rim is not affected. It does look like a thin film of glue but you said the area is sunken in (which again rules out Cud). Did you try acetone just to be sure it isn't something on the coin?
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