en.wikipedia.org
He was the last goalie to play without a mask in the NHL, on April 7, 1974, in a 6–3 loss to the Atlanta Flames; he continued to play without a mask throughout his three seasons in the WHA. His insistence on playing barefaced earned him the nickname "Fearless".
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I remember watching Brown play once or twice for the WHA Indianapolis Racers (Messier and Gretzky's first pro team) against the WHA Cincinnati Stingers. I-and I'm not kidding-was in a state of terror watching him.
This was in the era of no limit on the curve of a stick and shots from the likes of Bobby Hull and many others had movements on their shots similar to curve balls and sinkers in baseball.
The only athletic activity that I can think of that's more insane than not wearing a goalie mask at the NHL/WHA level is rock climbing