"Only game I could find where Ken Dryden wears this "Plante" mask is Buffalo at Montreal Forum on March 20, 1971. In 2nd period Ken & Dave Dryden make NHL history after Ken goes in for injured Vachon. Except for the Brothers Dryden photo, it's the first time seeing the others with him wearing the Plante-esque mask. Funny thing here is that it looks like Ken and Dave are wearing identical masks that night. What were the odds?"