{"product_id":"swartchild-black-shield-clock-mainspring-3-4-x-23-mm-x-21-ref-34-23-c-54","title":"Swartchild Black Shield Clock Mainspring 3.4 x .23 mm x 21¼\" Ref 34-23 C 54","description":"\u003cp\u003e\u003cstrong\u003eSwartchild \u0026amp; Co \u003cem\u003e\u003c\/em\u003e\u003c\/strong\u003e\u003cem\u003eBlack Shield\u003c\/em\u003e\u003cstrong\u003e\u003cem\u003e\u003c\/em\u003e\u003c\/strong\u003e Clock Mainspring, Tongue End, for Kienzle 31 \/ 171, 31\/172, 31 \/ 173 \u0026amp; Muller 39\/75, Solo 74 TIME side only, GR Ref. 34 - 23 C 54, steel, made in France. See images for precise mainspring specifications. I specialize in hard to find watch \u0026amp; clock parts and all parts are unconditionally guaranteed. Images do a pretty good job of representing the item\u003c\/p\u003e","brand":"Swartchild \u0026 Co.","offers":[{"title":"Default Title","offer_id":48961121714484,"sku":"CMS-SW3423C54S-12","price":7.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-12-0615.44.28.jpg?v=1765064937","url":"https:\/\/www.vintagetimeparts.com\/products\/swartchild-black-shield-clock-mainspring-3-4-x-23-mm-x-21-ref-34-23-c-54","provider":"Vintage Time Parts","version":"1.0","type":"link"}