{"product_id":"omega-816-1861-speedmaster-mainspring","title":"Omega 816, 1861 Speedmaster Mainspring","description":"\u003cp class=\"p1\"\u003eGenuine Generale Ressorts Swiss-made replacement mainspring for the Omega 861, 1861 and related manual-wind Speedmaster movements.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe 861 and later 1861 families powered generations of Omega Speedmaster Professional watches and are among Omega’s most important manual-wind chronograph movements. These are highly collectible watches that continue to be regularly serviced and restored.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eFor a movement like the Omega 861 or 1861, mainspring quality and dimensional consistency matter. There’s no mystery about what you’re installing: GR33001 is a branded Swiss mainspring made by Generale Ressorts, a leading specialist manufacturer of watch mainsprings.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eIs GR33001 compatible with the Omega 861 and 1861?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eYes. GR33001 is a replacement mainspring for a broad family of Omega manual-wind chronograph movements spanning the 861 and 1861 generations.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eCompatible Omega Movements\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e860\u003cbr\u003e861\u003cbr\u003e863\u003cbr\u003e865\u003cbr\u003e866\u003cbr\u003e920\u003cbr\u003e930\u003cbr\u003e1861\u003cbr\u003e1861A\u003cbr\u003e1863\u003cbr\u003e1866\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eSpecifications\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eManufacturer: Generale Ressorts\u003cbr\u003eManufacturer Part Number: GR33001\u003cbr\u003eType: Manual-wind mainspring\u003cbr\u003eHeight: 1.30 mm\u003cbr\u003eThickness: 0.115 mm\u003cbr\u003eLength: 420 mm\u003cbr\u003eBarrel Diameter: 10.5 mm\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eAmplitude Watch Parts ships from the USA, so there’s no need to worry about long overseas shipping delays or tariffs.\u003c\/p\u003e","brand":"GR","offers":[{"title":"Default Title","offer_id":49540426956990,"sku":null,"price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0768\/6048\/9918\/files\/GR_image_784d4a07-94f1-4f46-a2ce-c27c72f91703.jpg?v=1779626759","url":"https:\/\/amplitudeparts.com\/products\/omega-816-1861-speedmaster-mainspring","provider":"Amplitude Watch Parts","version":"1.0","type":"link"}