One of the many types of marking gauges (keshiki). Some are as simple as nails and wood scraps, others have thumbscrews to tighten the beam. This particular type is used to rip thin pieces of clear grained softwood into strips. The curved shape of the bottom allows depth control of the knife while slitting. It is used in a couple of progressive passes. The first pass would score the wood and the second would slit the wood. In thicker woods, the board can be flipped over and scored and slit from both sides.
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