Age of Nail (Savannah, Georgia)

[bkstyl]

While on a family trip to Georgia we stopped in Savannah for two days. Day 1 we had heavy rain and hail. While shopping around River Street we we found a nail that looks old between the balance-stone streets. Any help you can provide with a rough age would be appreciated.

 

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[bkstyl]

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Thanks for the information. It looks to be a type B (1810-1900) Boat nail. Does that seem like a reasonable guess?