According to Pierre-Marie Guihard of the University of Caen, the discovery is among the most important finds in Europe in recent history.
The farmer who owns the land, discovered the vase during the construction of a fence.
The formal excavation of the vase was carried out in the summer of 2011 by the Center for Ancient and Medieval Archaeological and Historical Research.
The coins are bronze with very little silver, weighing 3 grams and are 18 mm in diameter, and typically date to 330 AD.
The coins were accumulated over a period of about ten years and placed in the vase in small pouches of fabric which have disappeared perished due to age.