The NC733R is the world’s most industrial lockstitch sewing machine.  It’s built to sew the toughest, thickest weighted materials.  This unit has extra high lift and room to insert large, thick goods such as horse saddles.  If you encounter multi-ply sewing, the 733R is perfect.  A great example is shown here in the video sewing 12 ply of industrial leather provided by Aircraft Interior Products.  The 733R has successfully sewn over 20 ply of this sheepskin leather.  It’s perfect for  saddles, heavy gauge seat belts, safety material products, military grade applications, etc.