Hello Jay,
1958 St. Louis Cardinals Team Signed Baseball
A 1958 St. Louis Cardinals Team Signed Baseball with the key signatures: Musial, and Boyer is worth about $175.-$250.
1976 Kansas City Royals Team Signed Baseball
A 1976 Kansas City Royals Team Signed Baseball with the key signature:Brett: is worth about $125.-$200.
Value is based on average prices of recently closed auctions. Prices may vary based on condition, and the type of authenticity that accompanies the signatures. 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. .
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 link I left below. -Steven KeyMan
http://keymancollectibles.com/teamsignedbaseball.htm
