Help Identifying Team Signed Balls

[JMEnglish27]

Originally Posted by davidan

I have a couple of Official MLB Balls autographed by entire teams from the early 1980's. One from the Athletics (includes Henderson, Billy Martin, etc.) I believe Joe Morgan is on it as well so may be 83/84 time frame.

I also have a similar one with Sparky and the Tigers.

2 Major questions
what is the best, most official way to identify, certify these?
over time even though they have been in cases a good number of the signatures have faded to varying degrees. How does this impact value, on these generally?

Best,

David

If Morgan is on the A's ball it's absolutely '84...that's the only year he played here.