But Bill Goodwin told the St. Louis (Mo.) Post-Dispatch he has another old card in the lot that could be a real prize.
The so-called Plank card that also goes on the block Tuesday features Hall of Famer Eddie Plank, who won 326 games for the Athletics in 1901-1917. The image is pretty rare and is in great shape.
"I think the Plank card is a real sleeper," Goodwin said. "Not only is it in incredible shape, it's only one of three Planks with a Piedmont back, and it is the highest-graded of the three."
"I think it could get close to $500,000," Goodwin predicted.
But it will be the Wagner card that will likely produce a career moment for Goodwin. The card, owned by an anonymous Texan, is considered to be in good condition with a VG-3 grading from Sportscard Guarantee Corp.
"There are only five graded higher," he said. "So this is one of the top examples in existence."
The minimum bid on the card is $300,000, but Goodwin told the newspaper he is looking at seven figures.
"This is probably going to be the highlight of Goodwin and Company," said Goodwin. "You dream of selling a Wagner in this condition."