The theme tackled a on Friday, 20th of November dealt with Testour’s ancient clock. The lecturer Mr. Abdel Halim Koundi, professor at the National School of Engineers of Tunis (ENIT) and the Faculty of Science of Tunis, provided the audience with information about this clock adorning the minaret of the City’s Great Mosque and about its specificity. It is worth to note that the latter was finally restored after having been broken for long years.