Vintage Singer 401A Slant-O-Matic. The 401A was only manufactured for a few years and this one is from the the first year of 1957. The 401a was a well built sewing machine with a number of built in decorative and utility stitches. Although the 401 is not hard to find it is very rare to find one with an original cabinet. This one has been tuned up and is ready to go.