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An autograph that is not authenticated by a creditable company could sell at half the market value or less. Two of the top, and most trusted authenticators are PSA/DNA, and James Spence Authentic (JSA). Collectors will pay more for signatures authenticated by either one. It may sound odd but in some cases PSA/DNA, and JSA authenticated signatures may sell higher than a Letter of authenticity from an unknown or less trusted authenticator that witnessed the signing even though PSA/DNA, and JSA did not. It's just a matter of collectors trust, and collectors will pay more for it. Check the respective websites Show Schedule to see if they will be in the area that you live. They also do business through the mail. If you did not acquire the signatures yourself, or are not sure of its origin, do your homework. Before spending money on having the autograph authenticatedfind signatures on line that have been properly authenticated, and compare them to yours. If you feel comfortable that they are authentic then proceed. Try these helpful Links below for comparing signatures.

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Q: Where can I get Mark McGwire signature authenticated?
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Related questions

What is mark mcgwire's nick name?

Mark McGwire's birth name is Mark David McGwire.


Mark Mcguire first home run ball as A kid signed?

Mark McGwire single signed baseballA Mark McGwire single signed baseball is worth between $150.-$250. Value is based on average prices of recently closed auctions. Prices may vary based on condition, and the type of authenticity that accompanies the baseball. Signatures that have not been properly authenticated could sell at half the market value or less.Inscriptions such as "70" will sell for more. Personal Inscriptions like Good Luck Chuck" will sell for less.To value the baseball as Mak McGwire's "first home run as a kid" it would have to be accompanied by strong provenance from Mark McGwire, and authenticated. Otherwise you just have a used Little League baseball signed by Mark McGwire.


When did mark mcgwire die?

Mark McGwire is still alive in 2010.


What is the value of a signed photograph by Mark McGwire before he retired?

A Mark McGwire signed 8 x 10 photo is worth about $60.-$120. Price will vary based on condition, and the type of authenticity that accompanies the signature. Photo composition, and appeal will effect the price as well. Part of the value will be determined by how well the photo displays the signature. The type of ink used, and how it stands out in contrast to the photograph will also effect the price. Sharpie would be most preferred for a photo. Larger and more desired pictures could sell for more. In a recent auction a Mark McGwire signed 8 x 10 photo sold for $64. The fact that Mark McGwire signed the photo before he retired will have no effect on value. The condition, and Authenticity of the signature as mentioned above will be major factors. Signatures that have not been properly authenticated could sell at half the market value or less.


What is Mark McGwire's birthday?

Mark McGwire was born on October 1, 1963.


When was Mark McGwire born?

Mark McGwire was born on October 1, 1963.


What is the Value of 1988 signed mark mcguire?

Mark McGwire signed baseball cardYou did not include what item Mark McGwire signed from 1988. I'm going to take it that it is a 1988 baseball card.A Mark McGwire signed baseball card is worth between $50.-$75.Value is based on average prices of recently closed auctions. Prices may vary based on condition, and the type of authenticity that accompanies the signature. Signatures that have not been properly authenticated could sell at half the market value or less.It doesn't' matter too much on which card was signed. In general, collectors of baseball cards would rather have a baseball card without the signature. The signature would be considered as a flaw in the condition of the card and will lower the value of the card as a collectible. If the signature has a lower value than the card it will lower the value of the card. The un-signed card will have a higher value.


What is weight of the 23k gold mark mcgwire collecter card?

The Mark McGwire 24K Gold Signature 62nd home run commemorative card issued in 1998 commemorating Mark McGwire's record breaking 62nt home run on September 8, 1998, with 62,000 made. The card was originally priced at $29.95 and sell today in the $15.-$20. price range.


Who did mark mcgwire play for in 1998?

Mark McGwire played for the St. Louis Cardinals in 1998.


What is the value of a broken bat signed twice by Mark McGwire?

A Mark McGwire signed bat is worth between $200.-$350. The most preferred bat for a signature is a bat closest to the size, and model the player used. The better the quality of the bat the higher collectors value it will have. Value is based on average prices of recently closed auctions. Prices may vary based on condition, and the type of authenticity that accompanies the signature. Signatures that have not been properly authenticated could sell at half the market value or less. Add for inscriptions. The bat with two signatures might not add value unless you come across a collector that think it is unique, and will pay more for it. In a recent auction a Mark McGwire signed baseball bat sold for $400.00


How old is Mark McGwire?

Mark McGwire is 54 years old (birthdate: October 1, 1963).


What did mark mcgwire weigh in 1998?

1998 Mark McGwire was 6'5" tall, and weighed 250 pounds