The Cartier Le Must lighters are well known for their high quality and simple but prestine looks. Cartier began manufacturing lighters in the 1930’s, and its first gas lighters launched in the 1970s (as var as my research goes).
These Cartier lighters are really well-engineered. The gas tank is one unit with the filling valve and outlet valve attached. It can be compared to the ink cartridges used in every ballpoint pen of decent quality, where every cartridge has a new tip. The tank can easily be removed by unscrewing the flint screw and removing the back plate. This makes repairing or replacing the gas tank very easy.
This lighter was the second generation of gas lighters, the Les Must line of Cartier, where the flame height can be adjusted with the adjustment wheel on the bottom plate. As of today, Cartier does not repair but only replaces gas tanks of this type.