The knight had pushed the vizor of his helmet back to be sociable,... 1939, Raymond Chandler, The Big Sleep, →ISBN, page 3:
He was a big man and looked terrifying in his armour and facelessness because of the helmet and vizor. 1966, James Workman, The Mad Emperor, Melbourne, Sydney: Scripts, page 71:
Heavy helmet with vizor of polished iron ... 2004, Wolfgang Bruhn, Max Tilke, A Pictorial History of Costume From Ancient Times to the Nineteenth Century, Courier Dover Publications, →ISBN, page 25: