Unless dated, old baseball photos can offer only a guess as to when they were taken.  An autographed team ball, when all players are represented, can often be pinpointed to a specific month, week or sometimes even a day.

Stars, semi-stars, and common players are all represented equally.  In fact, the autographs of many commons may be harder to come by individually than many stars. While the accomplishments of a team in a given season can be dubious like the 1988 Baltimore Orioles or glorious like a World Series champion Yankees signed ball, the ball autographed by a team represents those accomplishments equally.

Usually, the absence of a signature by a player can help define when a ball was signed due to the date of the transaction either by trade or free agency. Of course, the more stars or Hall of Famers on a ball will result in a greater value and a higher price.

Finding an authentic team signed baseball in great condition can be a bit of a challenge. Because of the nature of the item, if all team members attempt to sign the ball right after one another smudges and smears are likely. These defects not only affect the value of the ball, but may also make authentication nearly impossible.

Depending on the price of the ball in question, a buyer may seek to have a third party authentication service certify the team signed baseball prior to completing purchase. However, a higher valued ball, for example the 1927 Yankees, will likely already have the necessary documentation proving its authenticity. One guideline however, a certificate of authenticity is only as good as the company providing it. Collectors should recognize the name, and perform some research before spending a lot of cash.   PSA/DNA, James Spence and others do a generally fine job with authentication.

Team signed baseballs are a great way to recall a World Series year, a record year for wins, or other team accomplishment. Because collectors have favorite teams and favorite players, this type of collectible benefits both desires. Sometimes just reading the names (though handwriting is sometimes questionable) can help a collector recall each individual player and the ups and downs of a baseball campaign.

The nostalgia can be somewhat overwhelming ten years down the road, as these great snapshots of history capture every player that was on the team at that specific moment.  Signed team baseballs make for a terrific collecting focus, whether you're collecting All-Star teams, World Series winners, specific teams or those from baseball's storied past.