Genuine Vintage Singer 401/403/404 Sewing Machine Carrying Case w Plug Extension. Offered for sale is a clean original. Singer sewing machine carrying case with plug extension. Case fits models 401, 403, and 404 with the plug extension included. To use with a 500, or 503, you will need a different base plate and plug extension. Can’t find the part you’re looking for? We have the largest selection of original vintage sewing machine replacement parts on the web. Showcase your items with Auctiva’s. This item is in the category “Crafts\Sewing\Sewing Machine Accessories\Other Sewing Machine Accs”. The seller is “snydersewingco” and is located in this country: US. This item can be shipped worldwide.