The mintmark itself isn't worth anything but that's what can make it work a lot of money.
While 1910 is not a rare date for Barber dimes, it is silver, so at a minimum it has a current silver value of about a dollar. You also need to check the back, near the bottom, for a mintmark. There may be a "D" or an "S" there. With full rims on both sides, and an "S" mintmark, it's worth about $3.00 If all the letters of LIBERTY on the headband are readable, then with no mintmark it's worth $2, with a "D" mintmark it's worth $6, or with an "S" mintmark it's worth $35 If all the details are strong, with only a slight amount of visible wear, then with no mintmark it's worth $15, with a "D" mintmark it's worth $35, or with an "S" mintmark it's worth $80 If your coin is a nice uncirculated example, then with no mintmark it's worth $75, with a "D" mintmark it's worth $150, or with an "S" mintmark it's worth $300
June 2011 If it has no mintmark this coin in that condition is worth $71. If it has a CC mintmark it is worth $570 If it has a O mintmark it is worth $70
First you need to check the back, above the "DO" in DOLLAR, for a mintmark. There may be a small "O", "S", or "CC" there. There may also be nothing there. In average circulated condition, with a "CC" mintmark, it's worth $80-$100. With any other (or no) mintmark, it's worth $8-$10 In almost uncirculated condition, with a "CC" mintmark, it's worth about $200. With any other (or no) mintmark, it's worth about $15 An uncirculated coin will be worth about $400 with a "CC" mintmark, $40 with an "O" mintmark, or $20 with an "S" (or no) mintmark.
The coin is worth one cent that's it, the lack of a mintmark just means the coin was made at the Philadelphia Mint. No US cent has ever had a "P" mintmark.
It depends on the mintmark.
If it has an "S" mintmark, it may be silver and worth up to $8.60 at the time of writing, however, if it doesn't have an "S" mintmark, it isn't silver and is only worth $1.
It depends on the mintmark and condition. A 1928 penny with no mintmark (thus minted in Philadelphia) in not that great of condition might only be worth $.10, however if it has a D (Denver) or S (San Fransisco) mintmark it could be worth a dollar or so in the same grade. If you have a perfect example it can range anywhere from $90-3,000 depending on the mintmark, but those are only for the absolute best coins, if you picked your coin out of circulation on average it would be worth $.10-$.20 with no mintmark and I'd estimate about $1-2 if it has an S or D mintmark.
Mercury dimes have the mintmark (if any) on the reverse, the "W" is the designer's initials not the mintmark. If you have an "S" mintmark you have a scarce coin worth more than melt, but it depends on the grade, a "D" mintmark is somewhat scarce but with high silver prices it is not worth much more than melt if circulated (melt is ~$2). If you have no mintmark it is an incredibly common coin worth only melt unless uncirculated.
It's worth 2 cents for the copper.
First you need to check the back, above the "DO" in DOLLAR, for a mintmark. There may be a small "O", "S", or "CC" there. There may also be nothing there. In average circulated condition, with a "CC" mintmark, it's worth $80-$100. With any other (or no) mintmark, it's worth $8-$10 In almost uncirculated condition, with a "CC" mintmark, it's worth about $200. With any other (or no) mintmark, it's worth about $15 An uncirculated coin will be worth about $400 with a "CC" mintmark, $40 with an "O" mintmark, or $20 with an "S" (or no) mintmark.
It is worth 1 cent unless it carries the mintmark "S".
Unless the coin has an "S" mintmark, it is worth 50 cents.