{"product_id":"elgin-factory-durapower-mainspring-for-13-0s-24hr-military-hack-grade-729-alloy","title":"Elgin Factory DuraPower Mainspring for 13\/0s 24hr Military Hack Grade 729 - Alloy","description":"\u003cp style=\"margin-left: 20px;\"\u003e\u003cstrong\u003eElgin \u003c\/strong\u003eDuraPower Factory Mainspring for 13\/0s Grade 729 24hr Military Hack Watches from the early 1960's, Refill #258 - 729, alloy, new in package. Do not come across these very often, see images for further details. I likely have several of these so the one you get may differ very 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":"Elgin","offers":[{"title":"Default Title","offer_id":49106991218996,"sku":"PMA-ELG258729A-04","price":15.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-04-2517.04.06.jpg?v=1777162111","url":"https:\/\/www.vintagetimeparts.com\/products\/elgin-factory-durapower-mainspring-for-13-0s-24hr-military-hack-grade-729-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}