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.
It is worth 1 cent unless it carries the mintmark "S".
Unless the coin has an "S" mintmark, it is worth 50 cents.
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.