Finned rim coins are highly collectible as they rarely escape mint packaging. Coins are placed into 20 count rolls and this finning (metal flow on the edge of the collar) is raised causing it to be thicker in that area. Neat find!
Severe" Finned Rim" Error! This " Severe" modern mint error is graded by PCGS with the following designation: Finned Rim Mint Error MS-69. A "fin" is a thin flange that extends vertically from the (rim/edge) junction of a coin struck within the collar. This is caused by excessive striking pressure or increase in striking pressure caused by slight die tilt. This excessive pressure causes the coin metal to squeeze into the narrow gap between the die neck and collar. Fins can develop on either side or both sides simultaneously. A fin may encircle a coin or may be restricted to one position.