{"product_id":"bestfit-mainspring-615e-for-as-1663-wittnauer-5d-alloy","title":"BESTFIT Mainspring 615E for AS 1663, Wittnauer 5D - Alloy","description":"\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cstrong\u003eBESTFIT \u003c\/strong\u003eMainspring 615E for AS 1663, Wittnauer 5D calibers movements and perhaps similar ébauche watches, white alloy, new in envelope. See images for precise mainspring specifications. 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 so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item. \u003c\/span\u003e\u003c\/p\u003e","brand":"BESTFIT","offers":[{"title":"Default Title","offer_id":48852141572404,"sku":"PMS-BEST615EA-08","price":7.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-08-1410.36.31_6f77fec7-7158-458e-a420-40fc8a316baa.jpg?v=1755193272","url":"https:\/\/www.vintagetimeparts.com\/products\/bestfit-mainspring-615e-for-as-1663-wittnauer-5d-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}