https://www.rugbyleagueproject.org/seasons/nswrfl-1975/round-2/canterbury-vs-cronulla/summary.html
https://www.youtube.com/watch?v=p0MpMJqoVJw
At 3:05 in this clip, Don Moseley scores a try. According to RLW, this was in the 5th minute of the match. at 3:04, there is a number 15 for Cronulla. Are you sure that number 15 isn't Graham Sams who was a late replacement in the game for Ken Maddison? There is 1-13 for Canterbury in the clip & 1-9 & 11-13 + 15 for Cronulla in the clip.