Info regarding Missing Edge Sacagawea Dollars?

Info regarding Missing Edge Sacagawea Dollars? Anyone have one?? I saw one on the registry. Does anyone know how many of these exist... What grades, sale prices, etc??
YN Sac collector!!!
To legit to quit!
To legit to quit!
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Michael Kittle Rare Coins --- 1908-S Indian Head Cent Grading Set --- No. 1 1909 Mint Set --- Kittlecoins on Facebook --- Long Beach Table 448
How many of these exist??
To legit to quit!