Bergeon 4040-P Large Synthetic Reversible Watch Movement Holder Large. This movement holder made by Bergeon is reversible which allows you to hold a wide variety of movement sizes, ranging from 20mm to 43mm. This unit is made of synthetic material which is non-marring and keeps the movement protected. This is a necessity for any watchmaker. For the very best watchmakers tools, always choose Bergeon. Made by Bergeon in Switzerland.