The MG-2DNR-1 is Merrow's Purl Stitch sewing machine, designed for the finest fabrics to stitch narrow rolled edging on lightweight or sheer knits and wovens, with more than 50 different feed dogs and 20 needle plates.
A-90-3 Upper Cutter - Wide, Serrated, used on 70-Class Machines. Commonly paired with a 6-91-E or 6-91-K Merrow Lower Cutter. Other codes for the a-90-3 are a903 or 76794336.