Agree with Master-G's comments with one clarification: the Nomad has a steel frame. Unlike the Challenger and Medalist I believe that all or some of the Nomads do not have a lock open feature on an empty magazine.
I recommend purchase of the pistol if the price is anywhere near reasonable.
The Medalist, Challenger, and Nomad were all made in Belgium in the glory days when hand machining and fitting were the way pistols were produced. They are entirely reliable, accurate, and a joy to own and shoot.