Official Oregon National Historic Trail Sesquicentennial Proof Set. Beautiful limited-edition three-piece proof silver medal set issued in commemoration of the Oregon National Historic Trail Sesquicentennial. This complete collector’s set includes. Three 1 Troy Ounce. 999+ Fine Silver Proof Medals. Original velvet presentation case. Certificate of Authenticity No. Each medal was double struck from one troy ounce of. 999+ fine silver and features detailed Oregon Trail commemorative artwork with mirrored proof fields and frosted devices. The medals remain housed in their original protective capsules. The presentation case shows light age-related wear but remains attractive and displays well. Please review all photos carefully, as they are part of the description and represent the exact set you will receive. Carefully packaged to protect the original presentation case, silver medals, and accompanying paperwork. Total Silver Weight: 3 Troy Ounces. Number of Medals: 3. Certification: Certificate of Authenticity Included. Country/Region of Manufacture: United States.