Longines Caliber L633.5

Brand	Longines
Caliber Number	L633.5
In-House?	No
Base Caliber	ETA 2824-2
Movement Type	Automatic, self-winding mechanical
Lignes	11.5”’
Diameter	25.6mm
Height	4.6mm
Jewel Count	25
Beat Rate	28,800 vph, 4Hz
Lift Angle	50 degrees
Power Reserve	38 hours
Rotor Style	Ball-bearing
Rotor Winding Direction	Bi-directional
Hand-Windable?	Yes
Anti-Shock Device	Incabloc
Hand Count	3
Functions	Central hours; central minutes; central sweeping seconds; date at 3:00
Hacking Seconds?	Yes
Quickset Date?	Yes
Country of Manufacture	Switzerland, Swiss made
Known Models	Longines Conquest Automatic, Longines Conquest Heritage, Longines Hydroconquest Automatic, (Add your watch to the comments below…)

The Longines caliber 633.5 is Swiss made lever style automatic watch movement with 25 jewels and a frequency of 4 Hz (28,800 bph).

It not an ETA clone, because it literally is an ETA. The L633.5 is essentially an ETA calibre 2824-2 with a Longines branded rotor. It is said to be an Elabore grade.

Longines L633.5 VS L633.1 / L633.2:

There is a vintage cal. L633.1 which is based on the ETA 2836. Differences between the 633.1 and 633.2 are that the L633.1 has 25 jewels and the L633.2 has 17 jewels.

Additional Resources:

• More Longines watch movements