Has an AFL game ever ended 123-19?
Exactly once. On May 27, 1933, Geelong beat Fitzroy 123-19, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 123-19 in league history.
That makes 123-19 the 3883rd most common final score out of 6,649 that have ever occurred in AFL. One point away, 124-19 has happened never and 123-20 has happened never.