Abstract : In the Nineties excavations made in La Rochelle (France) have produced objects of archaeometallurgical evidence with regards to the second royal mint. For the time being, this workshop is still the only one that has been discovered in France. Moreover, the observations of the artefacts seem to allow the reading of the whole money making process. These archaeological samples, complemented with ceramics from the medieval mint of Montreuil-Bonnin (France), have been studied by an archaeometric approach to propose an original research on the official French hammer striking process. This multidisciplinary study is based on the analysis of historical samples but also on a bibliographic compilation: monetary treaties, official reports, mint accounts... The experimental work takes an important part in the study too. Providing more than experimental samples easily studied and compared with the archaeological ones, this pragmatic method allows to point out the complexity of a technique. Finally, the gathering of all data defines the raw materials and the processes used in the French hammer coining until the mid XVIIth century, but also their respective purposes. As a particular coinage, counterfeiting has also been studied through two post-medieval examples that took place in Southern France caves. The experimental study reveals the originalities of these illegal activities besides some links with the official processes.