From 1969 there was
only one Secondary Dux Medal awarded instead of Senior
Boy/Girl. In 1972 when the school reverted back to being
a Primary School the award of a Dux Medal ceased altogether.
Could be wrong but this was most probably the inception of the namby
pamby brigade into education when it was thought improper or immoral
to have winners and losers in case it offended little Johnny or Jane
and caused them lasting psychological damage.