Ended up with the 403a. It's missing the bobbin cover but I already have one on order. It runs nice and smooth. Extremely quiet. Just very dusty. The light even works still. :
Restoration of a 1959 Vintage Singer Model 403A Sewing Machine – Professionally Restored Vintage Fine Quality Sewing Machines
Singer 403A electric Sewing Machine in cabinet | Hobbies & Crafts | Kitchener / Waterloo | Kijiji
Singer Slant-o-Matic 403 Sewing Machine review by Terri A
I picked up this Singer today at an antique store. Trying to find how old it is but can't find the model number. Anyone have an idea ? : r/vintagesewing
401 / 403 / 404 - OldSewinGear
Vintage 1950's Singer Model 403A Slant Needle Sewing Machine w/Accessories
NGOSEW Electronic FOOT CONTROL CORD & PEDAL works with SINGER 301, 301A, 401, 401A, 403, 403A, 404 NEW!!! : Amazon.ca: Home
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ida on Twitter: "FOR SALE Vintage Singer 403A Sewing Machine 🧵 - Repaired, barely used, works fine!! - Includes case, really old manual, accessories - 110V, doesn't include transformer RFS: not using
1958 Singer 403a Sewing Machine Tons of Attachments Booklet Great Working Cond. | eBay