This is not just a watch; it is a high-grade mechanical Chronometer, representing the absolute pinnacle of mid-1970s Jaeger-LeCoultre engineering. The reference 24002-42 is defined by its substantial cushion case and the rare "Chronometer" designation, signifying that the movement inside was adjusted for superior accuracy, placing it in the elite tier of JLC timepieces from that era.

Flipping the watch over reveals a deeply personal, historical provenance: an engraving dedicated to "J.H.J. Van Vuuren" for service from 1950 to 1977, transforming this piece from a standard dress watch into a tangible artifact of a 27-year professional career.