{"product_id":"marco-no-610-mainspring-for-16s-e-howard-l-model-factory-55-steel","title":"Marco No. 610 Mainspring for 16s E. Howard \"L\" Model Factory No. 55 - Steel","description":"\u003cp\u003e\u003cstrong\u003eMarco\u003cem\u003e\u003c\/em\u003e \u003c\/strong\u003eMainspring No. 610 for \u003cstrong\u003eE. \u003c\/strong\u003e\u003cstrong\u003eHoward \u003c\/strong\u003e16s \"L\" Model movements, Factory No. 55, steel, new in envelope. See images for further details. These will also fit the 18s \"N\" but that #55 is usually a couple of inches longer than this one. 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 and all watch parts are unconditionally guaranteed. mages do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Marco","offers":[{"title":"Default Title","offer_id":47451959165236,"sku":"PMA-CEM0610S-08","price":15.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-08-26_19.22.25.jpg?v=1756261478","url":"https:\/\/www.vintagetimeparts.com\/products\/marco-no-610-mainspring-for-16s-e-howard-l-model-factory-55-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}