A Pittsburgh Pirates team signed Baseball from the 1970's could be worth anywhere from $125. -$800. depending on the year the team played. If the baseball has the signatures of players from multiple years it could have a lower value than a baseball from a specific year.
To figure out what year the baseball is from visit the Pittsburgh Pirates team signed baseball price guide link located below (Related Links). The price guide features links to full team rosters to help you figure out what year the baseball is from. Searching for the players that played the least amount of time for the team will help you figure it out quicker. Once you have narrowed it down to one year the price guide also provides a list of key signatures for that year. These signatures are the most important on getting top value.
The added value as a "game used" baseball will rely on your ability to prove so. Otherwise it could lower the value of the signatures based on condition. A clean mint condition baseball would be most preferred to display the signatures. A "Game used" baseball would have to be accompanied with provenance, and the quality of the provenance will dictate the added value. A letter from a player, team, or League official would be acceptable. A letter from a fan at the game would not hold much weight if any. Without provenance the added value will rely on the buyers belief in your story.
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A 1980 Pittsburgh Pirates Team Signed Baseball with the key signatures: Stargell, Blyleven, Parker, Tekulve, Candelaria, and Madlock is worth about $150.-$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 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.
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 see Related Links below.