Singer 221 Featherweight -- Crinkle Finish

The bed of the crinkle finish featherweight has a dull dark gray/black textured finish unlike the typical shiny finish and three parallel grooves cut into the perimeter. Its faceplate is either the standard plated striated faceplate that was introduced on Featherweights during the AH serial number series in 1947 or a plain black faceplate with three vertical grooves down the center.