A Multifunctional Timepiece, anonymous, c. 1600 - c. 1650
Even before the invention of portable clocks, people in the 17th century could tell time already with this pocket instrument. It housed a sundial for use in daytime and on the outside there was a so-called nocturnal. By aligning the little hole in the lid with the Pole Star and rotating the pointer arm to the correct date it was also possible to determine how late it was at night.