{"product_id":"marco-mainspring-520-for-16s-illinois-bunn-sangamo-special-factory-no-47330-steel","title":"Marco Mainspring #520 for 16s Illinois Bunn \u0026 Sangamo Special Factory No. 47330 - Steel","description":"\u003cp\u003e\u003cstrong\u003eMarco\u003c\/strong\u003e Mainspring #520 for 16s \u003cstrong\u003eIllinois \u003c\/strong\u003eBunn \u0026amp; Sangamo Special Factory No. 47330, steel, new in envelope. See images for further details. Pretty darn sure these are just repackaged factory mainsprings. 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.\u003cbr\u003e\u003c\/p\u003e","brand":"C \u0026 E Marshall","offers":[{"title":"Default Title","offer_id":49037234733364,"sku":"PMA-CEM0520S-02","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-02-0715.39.43.jpg?v=1770507825","url":"https:\/\/www.vintagetimeparts.com\/products\/marco-mainspring-520-for-16s-illinois-bunn-sangamo-special-factory-no-47330-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}