{"product_id":"chronographe-gruen-precision-770r","title":"Gruen Precision Chronograph 1970's","description":"\u003cp\u003e\u003cem\u003eA unique chronograph from a forgotten brand.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReference 770R\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Gruen Precision 770R chronograph dates from the 1970s. Gruen is an American house founded in 1894 in Ohio. From its early days, Gruen built a reputation for the precision and reliability of its watches. In the early 20th century, it was considered one of the greatest American watchmaking houses. \u003cbr\u003eUnfortunately, it did not survive the quartz crisis and disappeared in the late 1970s. \u003cbr\u003eThis model houses the Valjoux 7730 caliber, which traces its origins to the famous Venus 188 caliber (a brand absorbed by Valjoux in 1966).\u003c\/p\u003e\n\u003cp\u003e  \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCase\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSteel\u003c\/li\u003e\n\u003cli\u003eDiameter 37 mm (without crown)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAcrylic crystal\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMovement\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eValjoux 7730 caliber, manual winding\u003c\/li\u003e\n\u003cli\u003eCam-operated bicompax architecture\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e  \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDial\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBeautifully patinated dial\u003c\/li\u003e\n\u003cli\u003eTelemeter and tachymeter \u003c\/li\u003e\n\u003cli\u003eApplied markers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eWrist size in photo\/video: 17 cm  \u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWatch serviced in July 2026\u003c\/strong\u003e\u003c\/p\u003e","brand":"Gruen","offers":[{"title":"Default Title","offer_id":53669306106203,"sku":null,"price":354500.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0995\/7919\/9835\/files\/DSC02921.jpg?v=1785482683","url":"https:\/\/vintagewatchspirit.com\/en-world\/products\/chronographe-gruen-precision-770r","provider":"Vintage Watch Spirit ","version":"1.0","type":"link"}