{"product_id":"marco-mainspring-173-for-4-0s-elgin-1st-model-factory-no-4789-steel","title":"Marco Mainspring #173 for 4\/0s Elgin 1st Model Factory No. 4789 - Steel","description":"\u003cp\u003e\u003cstrong\u003eMarco\u003c\/strong\u003e Mainspring #173 for 4\/0s \u003cstrong\u003eElgin\u003c\/strong\u003e 7 to 17J 1st Model movements, Factory No. 4789, steel, new in envelope. See image for further details. 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.\u003cbr\u003e\u003c\/p\u003e","brand":"C \u0026 E Marshall","offers":[{"title":"Default Title","offer_id":48894384472372,"sku":"PMA-CEM0173S-09","price":3.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-09-1420.31.34.jpg?v=1757907179","url":"https:\/\/www.vintagetimeparts.com\/products\/marco-mainspring-173-for-4-0s-elgin-1st-model-factory-no-4789-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}