{"product_id":"swartchild-black-shield-mainspring-4395-for-16s-n-y-standard-excelsior-3196-steel","title":"Swartchild Black Shield Mainspring #4395¾ for 16s N.Y. Standard Excelsior 3196 - Steel","description":"\u003cp\u003e\u003cstrong\u003eSwartchild \u0026amp; Co.\u003c\/strong\u003e \u003cstrong\u003e\u003c\/strong\u003e\u003cem\u003eBlack Shield\u003c\/em\u003e\u003cem\u003e\u003c\/em\u003e Mainspring #4395¾ for 16s N.Y. Standard \"Excelsior\" movements, Factory No. 3196 (or 1731), steel, HOLE end, new in envelope. See images for further details. Probably fits other American watches as well. I likely have several of these so the on 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 barely adequate job of representing the item.\u003c\/p\u003e","brand":"Swartchild","offers":[{"title":"Default Title","offer_id":48929970159924,"sku":"PMA-SWA4395S-10","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-10-28_16.26.47.jpg?v=1761694637","url":"https:\/\/www.vintagetimeparts.com\/products\/swartchild-black-shield-mainspring-4395-for-16s-n-y-standard-excelsior-3196-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}