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In November and December, this object is exhibited in the study centre of the Science Park. Who can tell what it is, has a chance of winning a dinner check from restaurant Polder.

The object is from the Special Collections, the historical depot of the University of Amsterdam. Next to valuable books, manuscripts and prints, Special Collections also collects scientific instruments.

The photograph shows a detail.

Do you know what it is, or would you like to make a guess? Then join the competition. You can send in your answer from 1 November until 23 December. The winner receives a dinner for two in restaurant Polder.

Would you like to see the mystery object up close or give your answer straight away, then go to the Science Park Library.

The competition is open to all students and staff of UvA.