Oris 400

	Brand:	Oris
	Family:	Unknown
	Height:	4.75 mm
	Jewels:	21
	Reserve:	120 hours
	Frequency:	28,800 A/h
	Winding:	Automatic, Two Barrel, Uni-Directional Automatic Winding
	Diameter:	30.00 mm (13.25 ligne)
	Complications:	Date, Hacking Seconds, Instant Date Change, Quick Date Correction
	Hands:	Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00

Distinguishing Technical Characteristics
Clockwise Balance Cock Balance at 6:00 Barrel at 10:30 Barrel at 1:30 Central Rotor
Production: 2020 – Current
1910s	1920s	1930s	1940s	1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s

Cal. 400 is a double-barrel automatic movement introduced by Oris in 2020. It features many modern features and gives the company a distinct advantage in the market. The long 120 hour power reserve and anti-magnetic properties are widely publicized by the company, as is the 10 year warranty and service interval. Unusually, it uses a lubricated sleeve bearing rather than the now-common ball bearing for the rotor, which Oris claims makes it more reliable.

One notable element of the movement is the rack and pinion style regulator, which moves a mobile stud for the balance spring. Another obvious element is the use of an eccentric clip to hold the rotor to the staff rather than a screw. The automatic winding is uni-directional, which is increasingly common in modern movements. It is likely that many of these elements were designed with cost as well as reliability in mind.

Details on Cal. 400 have been scarce and somewhat conflicting. Some reports claim that the movement measures 28 mm in diameter, which contradicts Oris’ official statement that it is 13.25 ligne or 30.00 mm in diameter. Some media have said that it measures 4.75 mm thick, though Oris has not officially released this dimension.

Cal. 400 was introduced in October, 2020, without a watch announced to house it.