A 1954 New York Giants Team Signed Baseball with the key signatures: Durocher, Mays, Antonelli, Irvin, Maglie, and Wilheim is worth about $1,500-$2,000.
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. Prices may also vary based on the amount of signatures, and key signatures acquired. The more complete the baseball with key signatures the more valuable. Horace Stoneman Owner of the Giants can add value as a key signature.
In a recent auction a 1954 New York Giants team signed baseball in excellent condition, and authenticated by PSA/DNA sold for $2,035. If the signatures are not properly authenticated the baseball could sell at half the market value or less.
For more information on team signed baseballs, links to full team rosters, key signatures, and price guide visit the page from the link I left below.