goldguru said:was the tip of the nail bent ?
if so it could have beeen used to Plank a small boat..under 20ft..
Brass nails made good salt water fasteners for smaller boats.
they bent the tip as it came in thru the stringer which is called clinching the nail.
a 2.5 in nail would have a 3/4 to 1in plank & a 1 inch rib allowing 1/2 to 3/4 of clinch. as most older boats didnt have luxury of planed wood thickness.
but without a pic. Im just babbling.