Learn how to clean the insides of a vintage sewing machine so that all of the mechanical parts work as smoothly as they did when the machine was first made. It's a valuable skill to have if you plan on buying more than one vintage machine.
Resurrect Vintage Sewing Machines - cleaning the chrome (fourth post in a series)
Art Nouveau Ladies' Sewing Machine No. 6 by F. Muller, nickel plated cast iron, this machine was probably marketed as a boudoir or travel machine, and incorporated the standard four-motion feed.
Cleaning and Removing Rust: Restoring Vintage Sewing Machines
Vintage Sewing Machine Transformations - The Sewing Loft
Resurrecting A Vintage Sewing Machines