GARY | The song is 100 years old. The lyrics -- the ones that you'll rarely hear -- are about a woman who loves baseball so much she laughs when her boyfriend offers to take her to the movies and instead utters the famous line, "Take me out to the ballgame."

The song written by Jack Norworth was honored Sunday at The Steel Yard with more than just the seventh-inning stretch. Before the start of the game, Gary Postmaster David Conwell Jr. and manager of post office operations Art Bacon unveiled the "Take Me Out To The Ballgame" stamp to the region. The stamp has been on sale at post offices across the country since June.

"We couldn't think of any way better to commemorate that with the people of Gary than here at the ballpark," Conwell said. "Just last week we did it at Wrigley Field, they did it at Victory Field in Indianapolis. We've had these all over. It's just another way for us to be out here in Gary."

The post office also sponsored a RailCats cancellation stamp, the black stamp at the top of an envelope that makes a postage stamp unusable.

The RailCats cancellation stamp is the team's baseball logo, with a "cat claw" holding a baseball that has an RC stitched into it.

Sunday's date also is on the commemorative cancellation stamp.

"The only place you can get this cancellation stamp is in Gary, Indiana," said Conwell, who added the cancellation would be available for the next 30 days. "It's not just a bar across the stamp. Like I said, really happy to be here."

Fans were greeted with USPS.com-sponsored soft-toss balls to the first 1,000 people through the gates, which Conwell was careful not to call "stress balls."

"We made it special with the squeezy, foam balls," he said. "I didn't want to call them stress balls. I don't want my employees stressing out."