The Narrabundah club, which owns the biggest piece of the Berlin Wall in the southern hemisphere, will celebrate the 20th anniversary of the fall this Saturday.

Club president Guenther Koerner said the 3m-high section installed outside the clubhouse was one of the ''better looking'' pieces of the Berlin Wall.

''Most of it's fallen apart because it was very poor concrete. But it stood up pretty well and it's unbelievable all the interest it's created,'' he said.

Mr Koerner, whose family hails from Stuttgart, was in Australia when he heard the wall had come down.

''No one believed it would happen the way it did. It was one of those things in history and now they tell us it's the most important point in German history,'' he said.

In 1992, Mr Koerner suggested the Harmonie Club should buy a piece of the wall as a souvenir and asked a friend in Germany to organise the job.

''It was more or less a joke, I rang him after the wall came down and said, is there a problem with getting one [piece]? He'd just been up to the Stasi, because they had put it up and it was their job to take it down again. They wanted $US200 [$A215] for a piece of the wall and we thought, 'That's not so bad.'''

The wall was sent to Australia on a Russian container ship and entered the country without a hitch.

''I think it was such an unusual thing that Customs didn't know what to do with it. They said, 'Well, just pick it up and go','' Mr Koerner said.

The slab of wall has been in Narrabundah ever since.

Mr Koerner said the graffiti was fading on the eastern side of the wall, possibly because of poor-quality paint, but the western side was still strong.

It caught the interest of locals and attracted visitors from further afield.

''We've had the mayor of Berlin coming to look at it because he didn't believe it was here,'' he said.

But how does the Harmonie Club know it's the biggest piece of the wall in the southern hemisphere?

Mr Koerner said there was a website dedicated to tracking chunks of the Berlin Wall and no other venue had a bigger piece of wall listed.''Over the last couple of days I studied the website and we are definitely the one.''

The Harmonie Club's Berlin Wall anniversary celebrations are on this Saturday at Jerrabomberra Avenue, Narrabundah.