Tim;
That is a copper nail that you use when you apply cedar shingles.
I think you could get-em at any hardware store.
I also buy the copper washers, and make rivets out of the nails, works very well with leather.
I roughed the nail up a bit with a file, they are slightly barbed when you buy them.
I decided to run the staple in that direction for no particular reason, just looked good in the maple. lol
Actually I have a plan, but I need my brain-tan deer skin, and since neither the wife or I can remember where we put it, might be a bit before I get it completed. lol
Did find the porcupine quills, so that's a plus.
I'm finishing up another horn that I started many moons ago, that staple runs the other direction.
I'll post pics when I'm done, as soon as you see it you'll know why.
Jim