Quote: Abnormally Strong Strike: Finning Definition: A fin is a thin flange that extends vertically from the rim/edge junction of a coin struck within the collar. It is caused by excessive striking pressure or a localized increase in striking pressure caused by slight die tilt. The extra pressure causes coin metal to squeeze into the narrow gap between die neck and collar. Fins can develop on either face or both faces simultaneously. A fin may encircle a coin or may be restricted to one pole. The latter is the kind typically produced by die tilt.
So the outer ring is the fin, in this case probably caused by a tilted die. I have a few coins with what I was calling double rims, now I know it is finning. Caused by extra pressure. On second thought I think it's the inner ring.
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