When the SACAGAWEA golden dollar was introduces in 2000, it afforded collectors several rare oppurtunities.  The design was gorgeous and the eagle ground breaking.  Collectors quickly discovered varieites that caused a coin hunt that still continues, to include the Cherio dollar and the Goodacre dollars.  But the mint never released what the public was really starving for ... which was a REAL mitage of real gold golden dollars....Or so you may have thought.  But the Mint actually did make real gold golden dollars, and they were on display at the ANA meeting at Milwaukee in 2007.  Eileen Collins, of NASA.  She was the first women astronaut to command a space shuttle and she carried with her 12 - 22 carot gold Sacagawea dollars that launched with Callenger.  39 were minted and 27 were melted down straight away.  The 12 best were selected to go  on the voyage and ended up in the end  at Fort Knox for posperity.    They are W mint marked, and have full tail feahers.https://www.coinnews.net/2007/07/18/22-karat-golden-sacagawea-space-dollars-landing-in-milwaukee/https://www.usmint.gov/coins/coin-medal-programs/circulating-coins/sacagawea-golden-dollar