$14 to $20 depending on condition.
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No mint mark indicates that the coin was minted in Philadelphia.
It depends if a 1880 silver dollar would be worth. If you can see that the first 8 in the coins date is over a 7, it could be worth $100-$250 dollars. If it doesn't have an 8 over a 7 its worth about $8.00.
"DO" isn't a mint mark. The mint mark on a silver dollar for that year is on the reverse (tails) side, just above the letters "do" in the word "dollar."
There are 3 possible mint marks - O, S, and CC. Please post a new question with the specific mark on your coin.
$27 to $70,000 depending upon the mint mark, the variety and the condition of the coin.