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Jim Harbaugh shared an interesting photo Thursday.

(Melanie Maxwell | MLive.com)

Jim Harbaugh was sorting through old photo albums Thursday, apparently.

Michigan's head coach shared a photo of legendary former Ohio State coach Woody Hayes wearing what appears to be a Michigan-style ball cap.

Harbaugh doesn't say where the picture comes from. But he does claim it's "unairbrushed."

Unairbrushed evidence has been uncovered that confirms Woody's love & strong feelings for the University of Michigan. pic.twitter.com/BCQYVwAAVG — Coach Harbaugh (@CoachJim4UM) March 9, 2017

Harbaugh, of course, has heaped praise on Hayes many times in the past. In 2010, after winning the Woody Hayes Award -- given annually to the country's top coach -- Harbaugh said the former Ohio State boss was one of his "heroes."

He also gave a tip of the cap to Hayes last season when he began wearing glasses that he said reminded him of the late Buckeye coach.