The information that was provided was found in the book: Artifacts of Colonial America by Ivor Noel Hume. (Don't shoot the messenger-call the author!) As noted, dating horseshoes is difficult at best. As with any hand-made item, the maker has the liberty to make it as he/she wishes. A current gunmaker could easily produce a flintlock rifle with all the early fixtures, but it obviously would not be old. Same thing with an ancient spear/arrow point. All one can do is go with the professional studies that have been documented and make your best guess.
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