Side by side

Differs

Longines Spirit Zulu TimeL3.812.4.53

Longines Spirit FlybackL3.821.4.53

Shape: Round; Round; Not known
Diameter: 42 mm; 42 mm; 42 mm
Thickness (differs): 14.1 mm; 17 mm; 15.25 mm
Lug to lug (differs): 49.4 mm; 49.5 mm; Not known
Lug width (differs): 22 mm; 22 mm; 20 mm
Material: Stainless steel; Stainless steel; Stainless steel
Bezel: Bidirectional rotating; Bidirectional rotating; Bidirectional rotating
Caseback (differs): Solid; Display (sapphire); Screw-down
Crystal (differs): Sapphire, Anti-reflective on both sides; Sapphire, Anti-reflective on both sides; Sapphire, Domed, Anti-reflective on both sides
Crown (differs): Screw-down; Screw-down; Push-pull
Water resistance: 100 m; 100 m; 100 m
Weight (differs): 112.9 g; 127.7 g; Not known

Calibre (differs): Longines L844.4; Longines L791.4; Breitling Gallet 23
Type: Automatic; Automatic; Automatic
Power reserve (differs): 72 h; 68 h; 65 h
Frequency (differs): 25,200 vph (3.5 Hz); 28,800 vph (4 Hz); 28,800 vph (4 Hz)
Jewels (differs): 21; 28; Not known
Certification: COSC; COSC; Not known
Functions (differs): Hours, minutes, seconds and date. 24 hours hand with time zone mechanism; Hours, minutes, small seconds at 9 o'clock
Chronograph mechanism: central 60 seconds hand and 30 minutes counter at 3 o'clock; Not known
Complications (differs): Date
GMT / second time zone; Chronograph
Flyback chronograph
Small seconds; Chronograph

The watches side by side