{"product_id":"ewing-bros-mainspring-for-howard-12s-no-552-made-by-waltham-steel","title":"Ewing Bros Mainspring for Howard 12s No. 552 Made by Waltham - Steel","description":"\u003cp\u003e\u003cstrong\u003eHoward \u003c\/strong\u003eMainspring for 12s, Factory No. 552, hole end, sold by Ewing Bros supply and made by Waltham, steel, new in envelope. This is not the first time I've run across a mainspring that Waltham made for a competing brand. Still it's a nice quality mainspring - and cheap too! 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 an adequate but perhaps incomplete job of representing the item.\u003c\/p\u003e","brand":"Waltham","offers":[{"title":"Default Title","offer_id":48706671345972,"sku":"PMA-WAL0552S-07","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-07-1915.13.55.jpg?v=1752963372","url":"https:\/\/www.vintagetimeparts.com\/products\/ewing-bros-mainspring-for-howard-12s-no-552-made-by-waltham-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}