The sort of unregarded tool that never survives. But this one did. Mowers using scythes to cut hay carried the horn sheath on their belt, and used the iron to keep the scythe razor sharp. Age has given the horn a wonderfully tactile texture. The iron is smooth on one side from use, and rough cast on the other. The form is unchanged since the Middle Ages, as the illumination shows.
Details and more photos.