GREEN BAY, Wis. (AP) — The son of a former Green Bay Packer says he is heartbroken after losing his father’s Super Bowl II ring, and he is offering a $5,000 reward for its return.

Mike Kostelnik told the Green Bay Press-Gazette that he believes he lost the ring that belonged to his dad, former Packers defensive tackle Ron Kostelnik, two weekends ago when he and his family went to visit his daughter at Indiana University and take another daughter to tour Miami University in Ohio.

He said he had been wearing the ring but took it off and stored it in the car’s console.

Kostelnik said he made only one stop along the way, at a BP gas station in Greensburg, Indiana. He said it’s possible the ring ended up on the floor of the car and was kicked outside the vehicle, he said.