The Chaplain-Duparc collection was built up between 1877 and 1878, following the exploration of megalithic monuments in Morbihan, and it remained for a long time in the vaults of the Tessée museum in Le Mans without being studied. When it was rediscovered in 1999, a remarkable series of ceramics came to light, ranging from early Neolithic to Iron Age with a few more modem pieces. Among this collection a remarkable group of Beakers was found. Their study, in the laboratory of Prehistory in Nantes, concentrated on a technoiogical approach to establish technoiogical and decorative caracteristics. So, some pottery, little known in the région alongside Beakers, enforce reconsideration of the Armorican component and the importance of "ancillary vessels" is emphasized. The internal chronology of Beaker and final Neolithic ceramics is also reviewed, with implications conceming Late Neolithic populations and emergence of Eahy Bronze Age ceramics.