Just post strike damage ( PSD). Something hit in the area of the S and pushed the metal away, causing the strange looking S. When trying to determine PSD versus an error, I always take the overall condition of the coin into consideration. Your coin shows numerous nicks and dings, so to me it would be a 99.9% chance that the S was caused by damage to the coin as well. Then, I can rule out an error by knowing the minting process, and what can and can't happen during striking that would cause that.

























