A fin, or wire rim, is a ridge of metal that is on a coin or token as a result of an improper metal flow. The medal gets between the die and the collar which results in an extended piece of metal above the normal rim of the piece. This Lincoln Civil War token has the highest fin that I have ever seen. This is a rare variety. This was a “vanity piece” for a 19th century collector. It has gold filled surfaces, and was struck quite sharply, which probably accounts for the high fin. The Fuld variety numbers for this patriotic token are 129/349. It is listed in DeWitt/Sullivan as AL 1864-77. It is rated as an R-9 with a surviving population of 10 pieces or less. That is probably close to accurate.