Has an AFL game ever ended 66-52?
Exactly once. On June 25, 1977, Hawthorn beat Richmond 66-52, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 66-52 in league history.
That makes 66-52 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 67-52 has happened 4 times and 66-53 has happened 6 times.