Very cool. I’ve certainly seen posts calling these things bunkum and I wonder if it is because the poster was trying to sharpen a modern bladeMany of these vintage honing/stropping devices were made either during wars or during the Great Depression so that people could save money and/or metal by getting more life out of a blade. The cool thing is that they actually work to prolong the life of a blade. The downside is that they do not work with modern stainless blades. They only work with carbon steel blades.