Designer: 

Diameter: ±14.3 millimeters

Metal content:
 Gold - 90%
Silver and Copper - 10%

Weight: ±25.8 grains (±1.7 grams)

Edge: Reeded

Mintmark: None (all were made at the U.S. Mint at Philadelphia)

Varieties:

Significant examples:
(See individual varieties)

Recent appearances:
1904 Lewis and Clark Exposition Gold Dollar.  PCGS MS-65.  Ex – American Numismatic Rarities, LLC’s “The Classics Sale,” July 25, 2003 , Lot 869, illustrated, sold for $7,360.00  From the Luther A. Breck Collection

1905 Lewis and Clark Exposition Gold Dollar.  PCGS MS-65.  Ex – American Numismatic Rarities, LLC’s “The Classics Sale,” July 25, 2003 , Lot 870, illustrated, sold for $10,925.00  From the Luther A. Breck Collection

1905 Lewis and Clark Exposition Gold Dollar.  NGC MS-64.  Ex – American Numismatic Rarities, LLC’s “The Classics Sale,” July 25, 2003 , Lot 871, illustrated, sold for $5,750.00

MS-64.  Ex - Ira & Larry Goldberg Coins & Collectibles, Inc.'s "Benson Collection, Part I", February 16, 18-20, 2001, Lot 4207, "1905 Lewis and Clark Dollar"

AU-55.  Ex - Ira & Larry Goldberg Coins & Collectibles, Inc.'s "Benson Collection, Part I", February 16, 18-20, 2001, Lot 4208, "1905 Lewis and Clark Dollar"

Sources and/or recommended reading:
"The PCGS Population Report, October 2002" by The Professional Coin Grading Service