{"product_id":"hr-mainspring-no-631-for-mst-caliber-369-steel","title":"HR Mainspring No. 631 for MST caliber 369 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHR Mainspring\u003c\/strong\u003e No. 631 for MST (Meyer \u0026amp; Studeli) caliber 369 movements plus perhaps other ones as well, steel, new in frail envelope. See images for further data and 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\/p\u003e","brand":"HR","offers":[{"title":"Default Title","offer_id":47452860318004,"sku":"PMS-HRM631S-08","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/3825255130.jpg?v=1705296197","url":"https:\/\/www.vintagetimeparts.com\/products\/hr-mainspring-no-631-for-mst-caliber-369-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}