Jens Anker Ventzel emigrated from Denmark to Australia in late 1960.
He is believed to have travelled to Katherine in the Northern Territory sometime shortly after arriving in Australia.
He wrote a letter from Katherine to his family in Denmark in which he stated that he planned to go hunting crocodiles with two unidentified brothers.
No correspondence was ever received by family after this and he has not been seen since. He is believed to have gone missing sometime between 1961 and 1962.
Anyone with information which may assist in locating Jens Anker Ventzel is urged to call Crime Stoppers on 1800 333 000.