Oil tycoon John Deuss told The Royal Gazette he may appeal his convictions for banking-related crimes in a Dutch court.Bermuda-based Mr Deuss, 69, was given a six-month suspended jail sentence and a fine of €327,000 ($409,000) after the case concluded earlier this month.He stood trial in Arnhem more than five years after he was arrested in Bermuda and voluntarily extradited to his homeland, Holland. The case related to his First Curacao International Bank (FCIB).His sister, Tineke, 66, of Berg en Dal in Holland, was tried and convicted on the same charges and received the same punishment.Both must serve two years of probation and the FCIB must pay a €1.2 million ($1.5 million) fine.Speaking of the case yesterday, Mr Deuss told this newspaper: “The Dutch court case was about banking in the Netherlands without a licence, having a branch office in the Netherlands without a licence, failure to report unusual transactions and participating in a criminal organisation. We were acquitted on the two principal issues.”He named those principal issues as the charges of banking in the Netherlands without a licence and participating in a criminal organisation.“The court ruled however that the administrative services rendered by our office in Berg en Dal, Holland, amounted to a ‘branch office’ of the bank in the Netherlands,” said Mr Deuss.“Therefore unusual transactions (which we filed in Curacao) should have been filed in the Netherlands.”He said he and his sister therefore lost the case in respect of having a branch office without a licence and failing to report unusual transactions.He revealed: “We are considering to appeal both on factual and strict legal points. Moreover, the fines and suspended sentences are totally disproportionate to how one deals with regulatory offences, which in our case didn’t take place as we will demonstrate on appeal.”Mr Deuss describe the court’s verdicts as “clearly wrong”.Mr Deuss, who has a home in Tucker’s Town, said he will be back in Bermuda later this week.According to the De Telegraaf newspaper in Amsterdam, investigators are continuing to probe allegations about FCIB. Prosecutors allege the bank was at the centre of a complicated tax swindle known as carousel fraud, which loses the UK billions of euros in tax every year.Asked about the status of the probe, Mr Deuss replied: “The preliminary investigation still continues after six years.”