1925 Fort Vancouver Centennial Half Dollar. Is a key silver commemorative coin with a low net mintage. Market Value & Specifications. 90% Silver, 10% Copper. Struck at the San Francisco Mint, but notably. Does not bear an “S” mint mark. This grade indicates the coin is “About Uncirculated” with only the slightest wear on the highest points of the design, often retaining much of its original mint luster. Features a bust of. John McLoughlin, the founder of Fort Vancouver. Depicts a frontiersman standing with a musket, with Fort Vancouver and Mount Hood in the background.