The Longines Master Collection ref: L2.773.4.78.6 features a stainless steel case with a diameter of 42mm. This automatic watch is powered by the Longines caliber L678.2 movement. It includes a silver dial with 24-hour indication, date, month, and chronograph functions, as well as a moonphase complication. The combination of these features makes it a versatile timepiece suitable for various occasions.