Model 29K51 "boot patcher"
This machine is often called the "boot patcher," it was (and still is) a staple in shoe shops. More pictures here.
Your Grandmother's
Sewing Machine
Refurbished Vintage Sewing Machines
copyrightfile:///Users/mckennalinn/Machines/Singer29K51/Singer29K51FootSideways.JPG McKenna Linn, 2008, all rights reserved