These are very common around here, I live in old farming country and these are hay knives. Just like table knives can be serrated and are, this hay knife is serrated. Saw teeth are of a different design. The serrations on this tool are very smooth quite different than what would be on a saw. There is no sawing action when it is used at least when I saw one demonstrated. It more of a whacking similar to the scythe in ROBBYBOBBYs image.