1p
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It depends on the shirt (t-shirt, replica jersey, authentic jersey, etc.), it's condition and who signed it.
if its a crayon signiture it will be worth $500,000
A lot
$10-$50
if its an authentic "game issued jersey" your looking around $300 (give or take). if its a replica probably around $75. I have a "game issued jersey" signed by emmitt smith and it was apraised at $750. so it boils down to what type of jersey you have and if its signed or not.
Wow! A Gehrig autographed game used jersey would be worth $800! Meahnwhile, a non game used, Gehrig signed jersey might only be $300.
ANSWER Depends on the item...I have a Carter signed rookie year authentic Raptors jersey and saw it selling for over $800 on the Grandstand Sports memorabilia site. An 8 x 10 auto. was selling for almost $200
How can you get a jersey signed by Isaiah Thomas
President Grover
Derek Jeter Signed JerseyA Derek Jeter Signed Jersey is worth about $450. - $600. Signatures authenticated by companies like Steiner sports or Upper Deck could sell for more.In general both jersey's would have the same collectors value. The difference in value might be decided by the number of collectors that show interest in the jersey at the time of the sale. The signed Yankees Jersey might be more desired, but the rarity of the signed USA Jersey might be the equalizer.The Bulk of the value will be decided by the condition of the signature, The Type of authenticity that accompanies the signature, and how well the signature is displayed on the Jersey. These could be the major factors on any difference in value.Collectors preference at the time of the sale would be a factor as to which jersey is most desired. Home or road jersey, the placement of the signature on the front or back, signed on the number or below the logo. They all have the same value, and the deference in value if put up for auction will be decided by the interest and preferences of the collectors bidding on it.