The purpose of this study is to characterize as accurately as possible the design and production methods of brass casting. Several pieces of church furnishings were available from a single atelier, that of the founder Guillaume Lefèvre, and date to the beginning of the 15th century, 1476. Items included both authenticated and attributed pieces: two pascal candlesticks, a choir candlestick, a baptismal font, and a holy water basin. A summary history is provided concerning Lefèvre, his foundry, and its production. Physical and technological descriptions of each of the works are provided; metal analyses were performed and the results recorded (composition of the alloy was determined by atomic absorption spectroscopy, and analysis of the core is given). These data are assessed to formulate an interpretation of Lefèvre's working methods.