With a 50-innings cut-off, Ponsford's 65.18 is the fifth-highest First-Class average in history.
Ponsford was the first to score two quadruple hundreds at that level (Brian Lara is the only other one).
+
Of all double-centurions to have held the world record for the highest First-Class score, Ponsford is the only one to have improved *on his own record*.
He got 429 against Tasmania in 1922-23, then 437 against Queensland in 1927-28.
+
Ponsford is the only cricketer to have scored hundreds in each of his first two *and* last two Tests.
And he did all this despite being colour blind. He could not tell a new ball from an old ball based on colour but had to rely on shape.
+