CharlieD
Chef Extraordinaire
The tool used to mash sauerkraut is a called a Kraut Krusher or a stomper. It doesn't look anything like Step's tool. Who Sells Kraut Krusher - 17" Sauerkraut Stomper | KITCHEN FOR NEW HOUSE
Oh, this is definitely is used as potato masher, at least in my house it always was. My mother still uses it at her house. Actually pretty much everybody I knew back in Soviet Union had the same tool for mashing potato. It was not until maybe 70-s when the new style, the metal thing with holes, started to show up.
I really do think, antic shop is the way to go.