Customized Chinese "Patcher" Leather Sewing Machine: This is a Chinese Patcher that has been customized.  The frame on this unit is an aluminum alloy and not the typical rough cast iron frame.  It is precision cast and smooth.      Though the control arms are not "perfect" in appearance, they came chrome plated, which should resist rusting for the long term.  The presser foot tension control, the stitch length control and both thread tension controls now have custom made thumb nuts instead