A 1963 New York Yankees Team Signed Baseball with the key signatures: Berra, Mantle, Ford, Howard, and Maris is worth about $800.-$1,000. 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. I do not have information on any recent auctions for a 1963 New York Yankees Team Signed Baseball. The price above might need to be up dated but should be close. Team Baseballs that feature a Roger Maris signature have been on the rise in recent years. 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 following page from the link I left below.