Shops Darning or Embroidery Spring attachment

Rare vintage Embroidery or darning attachment for Low Shank sewing machines
Fits the Singer Featherweight 221 & 222K and all low, vertical shank Sewing Machines (i.e. 15, 27, 28, 66, 99, 185, 127, 128, 192, 201, and the like.
Please see all pictures as they form part of the description
Postage includes packaging and will shops be tracked and signed for.