I bought this from a CCF member and it just arrived today. Beautiful half dollar! Abe Lincoln was 23 years old the year this one left the mint. Who knows, maybe it was in his pocket once upon a time.
The unknown historical "secrets"...the unknown provenance of a coin like this, (if only coins could talk and tell you where they've been) ... ... is one of the most enjoyable aspects of collecting. For me at least.
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To the naked eye it looks like an area where the toning is simply "missing". Could be a light scuff/AMD that happened AFTER the darker toning occured? But for the most part it didn't damage the metal, just made the color lighter.