Tucker Pintuck Attachment, Singer (Vintage Original) - BLACKSIDE Low Shank theme-spring Included with this machine is

Included with this machine is the original shipment tag with the machine's serial number

and many 221 machines made this close to the end of production had a few unique features

In other words

for tip starting January 2020

Flat Work Darner

Tucker Pintuck Attachment, Singer (Vintage Original) - BLACKSIDE Low Shank theme-spring Included with this machine isTucks or Pintucks make very attractive trimming when well made this vintage original Singer Tucker Attachment will aid you in creating a delicate and lovely embellishment with precision. Always in fashion, tucks add smartness and interest to dresses, blouses, neckwear, children's clothes and lingerie. Even, fine stitching following the exact thread of the fabric are the marks of fine workmanship in tucking. The Singer Tucker with its adjustable guides