The 1951 Chatham Cup was the 24th annual nationwide knockout football competition in New Zealand.
Eastern Suburbs' Reg King became the sixth player — and the first since 1945 — to score a hat-trick in a Chatham Cup final.
The first half of the final was even with Northern having the better of the opening minutes and gaining the lead through Trevor McFarlane.
The second half was entirely Eastern Suburbs', despite playing much of it with ten men after Frogley left the field injured (this was in the days before substitutes were allowed).
Centre-forward King put the Aucklanders ahead, and the lead was soon doubled by Jack Anderson.