{"product_id":"bestfit-mainspring-104x-for-beguelin-caliber-9-unitas-calber-431-pocket-watch-alloy","title":"BESTFIT Mainspring 104X for Beguelin caliber 9 \u0026 Unitas calber 431 Pocket Watch - Alloy","description":"\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cstrong\u003eBESTFIT \u003c\/strong\u003eMainspring 104X \u003cem\u003e\u003c\/em\u003efor 19 ligne Beguelin caliber 9 and 18½ ligne Unitas caliber 431 pocket watch movements, plus perhaps similar ébauche watches, white alloy, new in envelope. \u003cspan style=\"font-size: 14px;\"\u003eSee images for precise mainspring specifications\u003c\/span\u003e. 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":47452091842868,"sku":"PMS-BEST104XA-07","price":12.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-08-28_12.01.21.jpg?v=1756407731","url":"https:\/\/www.vintagetimeparts.com\/products\/bestfit-mainspring-104x-for-beguelin-caliber-9-unitas-calber-431-pocket-watch-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}