The 191’s were a cast iron vertical oscillating hook straight stitch model with reverse stitch and a drop feed capability for free motion work.
191K made in Scotland
191J made in Canada
Slant 301 machine
The 301 was just the beginning of a legendary family of Singer slant needle machines. ... If the needle is straight up and down you have a vertical needle machine. If it angles forward then your machine is a slant needle.