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			You are correct in that rough rayskin would provide a better grip than polished rayskin.  Polished rayskin most often appears on scabbard as opposed to handles.  Looking at all the securing nails and the poorly executed seam I doubt this material is the original grip wrap but rather a much later addition executed in a non-traditional way.(rayskin is usually glued down, not tacked down with dozens of nails.)
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