{"product_id":"swartchild-black-shield-mainspring-for-hamilton-16s-534-steel","title":"Swartchild Black Shield Mainspring 4372B for Hamilton 16s No. 534 - Steel","description":"\u003cp\u003e\u003cstrong\u003eSwartchild \u003c\/strong\u003e\u003cem\u003eBlack Shield\u003c\/em\u003e Mainspring No. 4372B for \u003cstrong\u003eHamilton\u003c\/strong\u003e 16s Motor Barrel movements, Factory No. 534, steel, new in envelope. See images for further details. I likely have several of these so the one you get may differ slightly from the images. I specialize in 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":48457231106356,"sku":"PMA-SWBS4372BS-05","price":7.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-02-05_08.38.17.jpg?v=1738773715","url":"https:\/\/www.vintagetimeparts.com\/products\/swartchild-black-shield-mainspring-for-hamilton-16s-534-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}