Longines Gents Master Collection Automatic Watch # L2.673.4.78.6. Swiss made automatic movement with 42 hours power reserve. Chronograph functions with Moon-Phase, Day, and Date calendar type. Sapphire crystal with anti-scratch coating. Approximate case diameter 40mm. White dial color. Stainless steel case. Transparent case back. Water-resistant to 30m/100 ft. Model Number: L2.673.4.78.6 L2.673.4.78 L2.673.4.7 L2.673.4 L2.673.