PREDATOR: Former Coast businessman Christian Walter Siebert has been found guilty of sexual offences against children.
PREDATOR: Former Coast businessman Christian Walter Siebert has been found guilty of sexual offences against children. WARREN LYNAM

Mr Coins sexually exploited girls, 4 and 6, while at Salvos

A FORMER Coast businessman is set to be sentenced for historic sex crimes against young girls.

Christian Walter Siebert, 62, ran Mr Coins collectable shop as well as a jewellery business from a small arcade in Ocean Street in Maroochydore during the first decade of the 2000s.

On Thursday is due to be sentenced in a South Australian court for two counts of persistent sexual exploitation of two girls while he was a Salvation Army officer between 1976 and 1978.

The girls, who were sisters, were aged four and six at the time.

Siebert was found guilty in August of the crimes.

Both victims first made statements to Victoria Police in 2004 and went on to give evidence at the Royal Commission into Institutional Responses to Child Sexual Abuse two years ago.

The District Court heard a Salvation Army couple were posted to a South Australian country town and moved there with their two daughters and son in 1976.

Siebert, who would later become a pastor, was aged 20 at the time and was an active member of the church congregation where he spent a lot of time with the siblings, who lived next to the church.

The older sister gave evidence that she came to trust Siebert as he was always around the church.

"He hugged her and gave her piggy back rides," Judge Gordon Barrett said in his decision.

"She said that when the accused started touching her inappropriately she did not see the wrongness of what was happening.

"The behaviour was generally more comforting."

But she told the court the sexual offending escalated.

"She said the accused would commit sexual acts on her in the church proper," Judge Barrett said.

Her younger sister alleged Siebert would touch her inappropriately but at such a young age, she didn't know it was wrong.

"Her account of the accused's sexual offending is more extensive than that of (her sister)," the judge said.

The court was told the offences against her included rape.

"He told her that if she told anyone what he'd been doing, he'd kill her, her family and her pets," Judge Barrett said. "She said she was devastated - she had no idea why she was in trouble."

Siebert denied any sexual impropriety, saying he never even played with them.

He also accused the women of colluding.

But Judge Barrett rejected the collusion claim, saying he accepted the sisters never told each other about their abuse and their experiences were different.