It was less than 100 years ago when the scythe was a common farm implement. In the proper hands it could be used to cut grass as neatly as a lawn mower, and was used to reap standing crops like wheat and barley.
The scythe itself is quite heavy and well balanced so the curved blade can be moved in neat rhythmic strokes, cutting swaths about a metre wide.
The scythe relied on having a sharp blade, and this stone was carried to ensure that. It is doubled handled so can be used on either end. The stone is about 30 cms long and 1.2 cms wide at the widest part.