{"product_id":"swartchild-black-shield-mainspring-440511-for-elgin-4-0s-no-4789-steel","title":"Swartchild Black Shield Mainspring #440511 for Elgin 4\/0s No. 4789 - Steel","description":"\u003cp\u003e\u003cstrong\u003eSwartchild \u003c\/strong\u003e\u003cem\u003eBlack Shield\u003c\/em\u003e Mainspring #440511 for \u003cstrong\u003eElgin \u003c\/strong\u003e4\/0s, Often called the Legionaire series, Factory No. 4789, steel, new in envelope. See images for further details. This particular one is covered in grease not unlike Elgin factory mainsprings (because it probably is one) and will need to be \u003cstrong\u003ecleaned thoroughly\u003c\/strong\u003e before use. I likely have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Swartchild","offers":[{"title":"Default Title","offer_id":48355587129652,"sku":"PMA-SWA440511S-11","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-01-21_10.30.29.jpg?v=1769020261","url":"https:\/\/www.vintagetimeparts.com\/products\/swartchild-black-shield-mainspring-440511-for-elgin-4-0s-no-4789-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}