{"product_id":"1964-john-muir-conservationist-5-martinez-ca-first-day-cover","title":"1964 John Muir Conservationist 5¢ Martinez, CA First Day Cover","description":"\u003cp\u003eThis 1964 First Day Cover features the 5¢ John Muir Conservationist stamp issued by the United States Post Office, cancelled on April 29, 1964, in Martinez, California, with a handsome Art Craft cachet.\u003c\/p\u003e\u003cp\u003eJohn Muir (1838–1914) was a Scottish-American naturalist whose advocacy helped establish the National Park Service and Yosemite National Park; he founded the Sierra Club in 1892 and his writings shaped the American conservation movement during the Progressive Era.\u003c\/p\u003e\u003cp\u003eThe Art Craft cachet depicts Muir seated on a rocky outcrop with walking staff, accompanied by the quote from William F. Badè: “His spirit still is watching over the people’s playgrounds!”—a fitting tribute to the “Father of the National Parks.”\u003c\/p\u003e\u003cp\u003eA fine addition for collectors of conservation history, national parks topicals, or Art Craft cachets, this cover remains in clean, collectible condition with a crisp first-day cancel.\u003c\/p\u003e","brand":"Maple Springs","offers":[{"title":"Default Title","offer_id":51388343451812,"sku":null,"price":4.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0580\/4713\/5908\/files\/20260623092741.jpg?v=1782235553","url":"https:\/\/maplespringsllc.com\/products\/1964-john-muir-conservationist-5-martinez-ca-first-day-cover","provider":"Maple Springs","version":"1.0","type":"link"}