3AW Breakfast host Ross Stevenson has spotted a mistake in today’s Herald Sun cartoon and believes it’s now a collector’s item.

He’s asked Mark Knight, if a signed copy of the cartoon can be used in an auction at an upcoming charity lunch, which led Knight to offer something even better.

“I’ll do you one better than that, Ross,” he said.

Press PLAY to hear what Mark Knight has offered, and what the mistake was

Image: Mark Knight/Herald Sun