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This looks like a shop-made dado plane. Unfortunately, I doubt that it can cut well. The escapement is very rough, but that probably doesn’t matter. The issue is the nicker up front. This needs to have parallel knife edges the width of the dado and they must be sharp to cut across the grain and must align with the main blade. What is there instead is a blade that appears to simply scrape the wood, not sever the fibers. I wonder if it could be sharpened differently. Offhand, it looks like someone took a blade from a hollow and stuck it up front in this plane.