A hard knocker is a bowler hat.
Examples in New Zealand literatureEdit
- "My uncle wears a hard knocker. His wife put him up to it."
- "We don't want a world full of dead men walking about in hard knockers."
Sargeson, Frank. "Conversation with my Uncle." A Man and His Wife/ Christchurch: The Caxton press, 1940. 39-40.