This is quite interesting. Thank you for posting. The tip is reinforced with a heavy, stretched leather and appears professionally done by a cordwainer. I wonder if this was incorporated in the original design or is it a later repair? The "strap", more like a wang or thong seems to be cut from the same leather.
A compass seems to have been used to scratch in the circles and arcs.
The author states that the butt has been glued but not nailed; I think I see indications of fastening holes in the butt area of the horn; one even looks like a countersink.
And there's that date, 1601, which can be seen within the square cartouche in the second photo. To me, looks quite like the Pennsylvania designs from 150 years later.