Antique Marvel Machine for Hand Embroidery 1918 Patent Princess Model B Stitcher

Antique Marvel Machine for Hand Embroidery. Patent date May 7, 1918.  Essentially operates like a needle punch or speed tufter. One needle is installed, it seems sharp-ish, but is oxidized. No instructions or extra needles included.  I have shown a photo of the machine diagram, but it is not included. Those familiar with punching and tufting tools will recognize the landmarks. The set screw at the top adjusts the stitch length or punch depth by sliding a collar. There are 2 guide holes for the thread. This model does not have spool holders.  Machine has smooth, easy action. The metal is scuffed from age and use, but not rusty. The surface has tiny dings and black spotting.  Fun artifact for collectors from the intersection of Industrialization and Victorian domestic arts! An identical machine was also sold by Princess Embroidery Supplies as the Model B.