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gilf, you are correct. I've searched and searched and found they are made by a company called Arnott's.
Here is what they have to say about them:
This is an unmistakable biscuit with its sprinkled sugar topping and crisp texture.
Nice biscuits have been a family favourite since 1922. Named after the city in the south of France, Nice biscuits were considered to be a sophisticated treat to have with morning or afternoon tea.
Today, they are a popular inclusion in Family Assorted and are good to have on hand for a sweet cheesecake base.