The 65-year-old athlete won gold for the throws pentathlon, hammer-throw, discus, javelin, weight throw, (a Busselton Regional Athletics Club record of 16.18m) and silver for shot-put.
His overall score of 3977 points was the second-highest at the championships.
Continuing his great performance, he finished second in the Champion of Champions, event which this year was the javelin throw.
Peters added the medals to his M65 State record for the throws pentathlon after winning five out of six categories at the State championships as well, with a bronze for shot-put.
The strong man will now set his sights on the Toronto 2020 World Masters Athletics Champions and, as a dual citizen, it will be a homecoming for the Australian-Canadian who is touted to place in the throws categories.
Other South West competitors to compete at the national championships were Michael Byrne and Rob Antoniolli.
Byrne tasted success in the M240 4x400m relay, with his team earning a silver medal.
Otherwise, it was a tough meet for the State champion, who finished fourth in the 400m in a very strong field, sixth in the 800m and sixth in the 60m dash with a good time of 9.11 seconds.
Byrne’s friendly rival and State 60m and 100m dash champion Antoniolli was sadly cut down by injury on the first day of competition with shortness of breath resulting from broken ribs.
The lively 67-year-old will now focus on recovery before the Masters Oceanic Championships in August, when he will renew his battle with “arch nemesis” Byrne.