The last pic makes the rear grip strap look as though it never had a stock lug. Machining on a lugged frame removes metal that would be there on a slick-backed variation. This looks fully rounded, the material is there. I suppose it's possible that the area was welded back in and properly contoured when it was refinished, but it's also theoretically possible that the upper has been installed on a non-Arty frame.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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