They are nice little 3/4 size machines. All mechanical, easy to use when you learn how. Get a manual and study it so you know what you are looking at. Muv has info on the long bobbin machines on her site and she has videos on the sticky notesL
http://www.quiltingboard.com/vintage...v-t167789.html
Muv
http://www.lizzielenard-sewingdesigns.co.uk
http://www.youtube.com/user/Muvandfarve?feature=mhee
http://www.lizzielenard-vintagesewing.blogspot.co.uk
Some times you can see them on CL for sale.
http://indianapolis.craigslist.org/art/3750339004.html
You can find manuals at singerco.com and then look for manuals.