The wire clip bail mechanism works in a similar way to the Hutter Stopper (1893) the type seen on Grolsch beer bottles. The combination of the wire clip, rubber seal and robust glass construction makes for a perfect and versatile combination.
When the jar is heated a vacuum forms inside the jar pulling the lid and rubber seal tight, this vacuum help preserve food for a long time. As the lid is vacuum sealed to the jar, breaking the seal would prove difficult if the jar was a normal screw thread variety. The Le Parfait jar overcomes this problem with the wire clip bail system acting to release the vacuum so the lid is easily lifted.
One of the beautiful aspects of this system is it’s ability to be used over and over. To achieve the same vacuum without this type of system would prove almost impossible in the home. Once the rubber seal is worn, that can be replaced extending the life of the jar almost indefinitely.
Modern Le Parfait Jars are produced by the same French company. Although Le Parfait didnt invent the system of rubber seal jars they have become synonymous with this style of jar the world over. The company Le Parfait was created in Reims in the early 1930s, at the beginning of the advertising boom. Its competitors were then the brands Le Meilleur, Le Pratique or Triumph. But Le Parfait had its own vision and approach of preserves. Slowly but surely, Le Parfait built its fame and became a synonym, in French families, of freshness and flavour
Original Le Parfait Jars I’m sure have long gone now, or at least a very rare. However you can still get new ones here.