Davison (60), an agricultural researcher from Christchurch, beat a 22-year-old record when he won the men's aged 60 to 64 hammer throw at Memorial Park.
He beat the South Island masters championship record that Dave Leech (Wellington) set in 1987 by 6.41m with his second throw of 46.59m.
It also beat the Canterbury masters record.
The former Otago athlete also beat the old mark with his first throw of 44.18m.
Davison learned the hammer throw when he was a boarder at Waitaki Boys High School in the 1960s.
He was runner-up at the New Zealand junior championships in 1967 and won the gold medal in 1968.
Davison competed as a senior athlete in the heyday of New Zealand athletics in the late 1960s until he retired in 1975.
He was pitted against athletes of the calibre of Leech, Warwick Nicholl and Daryll Gilliland.
His best performance in the senior ranks was fourth.
He returned to competition as a masters athlete eight years ago and the sport is an important part of his life.
"It's a way of life for me now," Davison said.
"I also watch my diet and don't eat rubbish food."
He proved his ability earlier this year when he won gold medals in his age-group in the hammer throw and the weight pentathlon at the world masters championships at Sydney.
Davison broke his second South Island record when he won the weight throw with 15.29m.
It beat the 1999 record of Barry Rait (Southland) by 43cm.
Mark Flaus (Southland), a 50- year old insurance consultant from Invercargill, set two records in the men's aged 50 to 54 discus (37.81m) and weight throw (14.80m).
The more significant record was in the discus when he beat the 1983 record of Otago's Graeme Lawless by 1.33m.
He beat Davison's 2003 record in the weight throw by 1.08m.
At the world masters championships in Sydney, Flaus won silver medals in the discus and the weight pentathlon and a bronze medal in the shot put.
Ron Stevens (77), a retired Christchurch Teachers College lecturer, broke two of his own records in the men's aged 75 to 79 grade.
He beat the 1500m time by 5sec in 5min 55.80sec and the 3000m by 19 seconds in 12min 41.40sec.
Stevens took up running 55 years ago at the age of 21.
In his heyday he finished fourth in the New Zealand senior men's three and six-mile championships in 1956.
Julie Wilson (Otago) beat the 1998 women's aged 50 to 54 1500m record by 8sec when she won the title in 5min 13.6sec.
Keith Hutton (Otago) equalled the 100m record set by former All Black wing Bruce McPhail (Canterbury) in 2000 when he won the men's aged 60 to 64 100m in 13.6sec.
Eighty-year-old former Otago athlete Stan Gawler (Canterbury) broke the men's aged 80 to 84 3000m record with a time of 16min 32sec and equalled the 1998 1500m record of 7min 33.4sec.
Southlander Alistair McKay (82), a retired sheep and beef farmer, broke his own 100m record in the men's aged 80 to 84 grade with a time of 17sec.
He was the oldest athlete at the championships.
Liz Wilson (Otago) equalled the Otago masters record when she won the women's aged 45 to 49 100m in 13.6sec.
Alex McEwan (Otago) sprinted from the bell to win the men's aged 40 to 45 800m in 2min 19.90sec from team-mate Kevin Duggan who clocked 2min 21.90sec.
In open events, Rebekah Greene (Hill City) broke the Otago girls aged 15 400m record with a time of 57.91sec.
The old record was set by Kirstin Downie (Leith) in 1984.
McKenzie Haugh (Hill City) broke the boys aged 13 long jump record with a leap of 5.67m.
Daniel Balchin (Caversham) won the open 800m in a personal-best time of 2min 00.10sec.
