I have a 2010 sacagawea dollar with no date or mint mark and it's not on the edge of the coin either....looking for some info on it and maybe what it's value is.
If does not have any edge lettering then its one of the missing edge lettering errors. Can't say anything about value without pictures.
You may have something of great value but we need pictures to assist you, while members here have a tremendous imagination it is certainly not enough
I'm guessing that the edge lettering has worn off over time from circulation, and that I why you cannot see anything there. I have one like that.