If I'm right this is an old pizza cutter you start on one end and roll to the other to watch someone professional use this is nest cause you wouldn't think I'm right until you see it in action
you maybe right, but i know they use something simpler in Alaska and works great with fish. i like to cook what we catch there and we fish every weekend,
It's called a mezzaluna (half moon) and was used with a wooden bowl to chop fish or meat and vegetables before food processors. It's probably from the 1950s or 60s.