The Longines Master Collection 42 Chronograph Calendar has a case of 42mm, which houses a self-winding movement with full calendar, moon phase indicator, and chronograph.Reference L2.773.4.51.6 has a case of 42.00mm and a Black dial. Pictured here with caliber L687.2, though it can be powered by either the L687 or L678 depending on the year of production.
