Australia's The Age has published more information about the theft of a plaque from AC/DC frontman Bon Scott's heritage-listed Fremantle gravesite, on what would have been the rocker's 60th birthday

The National Trust of Australia brass plaque, which proclaimed the heritage listing, is believed to have been stolen from the gravesite at Fremantle Cemetery sometime between Saturday afternoon and yesterday afternoon. (View photos of the grave: Photo#1, Photo#2, Photo#3.)

Yesterday would have been Scott's 60th birthday.

Doug Thorncroft, self-described "head honcho" of the WA Bon Scott Fan Club, said he was "shattered" by the theft.

"It's very disappointing, particularly at this very special time of the year," Thorncroft said.

"Some insignificant individual has decided to sabotage it, and steal this plaque," he said.

Thorncroft said he thought the theft had probably been an alcohol-fuelled spur-of-the-moment thing.

"They're possibly sitting at home now feeling terrible, which I hope they are," he said.

Thorncroft said the theft may lead to tighter security around the grave, which is a popular tourist destination, attracting thousands of rock 'n' roll pilgrims every year.

Scott was born in Kirriemuir, Scotland, but emigrated to Australia at the age of 6.

Growing up in Perth, the high-school dropout joined AC/DC in 1974 and the band went on to become one of the most popular and successful acts in Australia, then across the world.

Scott was found dead in a friend's car in the early hours of February 19, 1980, after a night of heavy drinking in London. He was 33.