Sayyed Muhammad Husaini Ragheb, Sayyed Muhammad Husaini Ragheb has a BA in Law from Guilan University, Iran and has also undertaken Hawzah studies in Qom. He is a Cultural Affairs director of Ethics Group of Al-Mustafa Open... Answer updated 1 year ago

Salaamun Alaikum
It is possible that they pronounce the permanent marriage contract without mentioning the dowry i.e Mahr, so they can decide on what it will be with a mutual consent after the marriage.
But if the intercourse takes place before determining the dowry, the woman will be eligible to ask for the Mahrul Mesl i.e. a dowry which is usually given to this type of girl with these characteristics and family and social position.