Average yearly wage in Australia in 1963, was $5807. Today it is approx $70,000. The first two 300s bowled attracted prizes including overseas trips plus $2000 prizemoney. The third won a trip to Japan plus a new Vauxhall car.
Convert that to to-days money, and that would equal prizemoney of around $33,500, for a 300 game. Never mind the overseas trips!
That sure must have been some Pizza!!!