{"product_id":"1975-pioneer-jupiter-10-mountain-view-ca-first-day-cover","title":"1975 Pioneer Jupiter 10¢ Mountain View, CA First Day Cover","description":"\u003cp\u003eThis Artmaster First Day Cover features a block of four United States 10¢ Pioneer Jupiter stamps, postmarked Mountain View, California on April 28, 1975. The colorful cachet depicts the Pioneer spacecraft approaching Jupiter, with the inscription “Pioneer Space Probe First Day of Issue.”\u003c\/p\u003e\u003cp\u003eThe stamps commemorate the historic Pioneer 10 and Pioneer 11 missions, the first spacecraft to fly by Jupiter and return close-up images of the giant planet. Launched in 1972 and 1973, these probes provided humanity’s first direct data on Jupiter’s atmosphere, radiation belts, and magnetic field, opening the era of outer-planet exploration.\u003c\/p\u003e\u003cp\u003eA notable detail is the four-stamp block cancelled with the official “Pioneer Jupiter First Day of Issue” slogan, paired with the classic Artmaster engraved cachet. The cover is addressed to Edward M. Germain, Jr. at #9 Pioneer Drive in Pekin, Illinois—an address whose street name echoes the stamp’s theme.\u003c\/p\u003e\u003cp\u003eA clean, well-centered example that makes an attractive addition for collectors of space exploration, NASA, or Artmaster cachets.\u003c\/p\u003e","brand":"Maple Springs","offers":[{"title":"Default Title","offer_id":51394932834468,"sku":null,"price":2.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0580\/4713\/5908\/files\/20260702111019.jpg?v=1783043443","url":"https:\/\/fdc-vault.com\/products\/1975-pioneer-jupiter-10-mountain-view-ca-first-day-cover","provider":"Maple Springs - FDC Vault","version":"1.0","type":"link"}