From my Father's collection...
1999 Yellowstone National Park Silver DollarProof and Uncirculated Silver Dollars
Mint - Philadelphia
Condition - Proof / Uncirculated
Weight - 26.73 grams
Diameter - 38.10 mm
Composition - 90% Silver, 10% alloy
Mintage Limit - 500,000 (all options)
Obverse - Geyser Action
Reverse - Adaptation of the Department of the Interior Seal / Buffalo
Ships carefully via USPS.