Hi,
Your Min A was made by Davis Sewing Machine Co. around 1904. Can't think of any gears that belong on bottom of machine, might be able to ID with photo. Minnesota A is a pretty basic vibrating shuttle, only problem it uses different needles and long bobbins than the industry "standard"--Singer. They are still available though. Have fun.
Jon
Almost forgot, Minnesota is a Sears brand name.
Last edited by jlhmnj; 10-10-2012 at 11:10 AM.