The Whitman Encyclopedia of Colonial and Early American Coins by Q. David Bowers is probably one of the easier to use and obtain books.
I only had a chance to glance at it, but I am about certain it is a 1787. There are a ton of 1787 varieties, I'll try to give it a shot when I...
What makes you think Philadelphia didn't mint nickels in 1971? They minted over 106,000,000 in 1971.
The ebay link is to an 1865 s, the poster said his is an 1865. HUGE difference in price between a Philadelphia mint coin and a San Francisco mint...
It may be a bubble in the plating? Don't really know but that would be my best guess.
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