Yes, Ecuador does use the Sac dollar coins and the US Dollar is their primary currency. Apparently one of the reasons why the coin is so well-liked down there is that Sacagawea, being Native American, is a more culturally familiar face than a dead white dude of European origin.
During the 80s, the Gov used Susan B. Anthony dollars in the Base exchanges and Clubs in Germany. I know some of those made it into the local economy. Most were purged or sent back to the GIs in the US occupied Kascerns.
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