Jaeger LeCoultre had its origins in the early 1800s.Their clock manufacture began about 1930.
JLC produced its inline 8 day baguette movements from about 1932 to 1980. The baguette is an 8 day, 16j. Cal. 210 movement. The movement was housed in numerous case styles over its long production time.
This example from about 1970 is in my mind one of the most elegant. The case is executed in faux lapis lazuli, the skeletonised chapter ring giving the whole a 3D quality. My experience with JLC cases suggests that they can deteriorate very quickly if not well cared for. This example is unusual in that it has spent a lot of its life in its custom case and has maintained its excellent condition.