The Q4138180 is a restrained take on the Master Control, pairing Jaeger-LeCoultre's practical mix of complications with a 40mm stainless steel case and blue dial. Its chronograph, calendar, and moonphase are laid out cleanly, so the dial stays balanced instead of busy. An automatic movement drives the display. At 12.05mm thick on a stainless steel bracelet, it has tidy proportions and works well as an everyday watch.