Sewing machine vibrating shuttle presser bar assembly from National sewing machine Damascus model. Assembly includes: presser bar with quilt guide set screw, presser bar vertical guide, presser bar horizontal guide with thread check spring (marked "R 186"), presser bar pressure spring and presser bar pressure regulating thumb screw (not in photo but included). All bit dirty but functioning parts for restoration project.
Should work on other National Sewing Machine Co vibrating shuttle machines. Nice vintage item.
Price includes shipping.