H. Moser & Cie Caliber HMC 804

Manufacturer	H. Moser & Cie
Caliber Number	HMC 804
Movement Type	Automatic, self-winding mechanical, tourbillon
In-House?	Yes
Diameter	32mm
Height	5.5mm thick
Jewels	28
Components	(Needs confirmed)
Vibrations Per Hour	21,600 bph (3 Hz)
Power Reserve	72 hours
Rotor Winding Direction	Bi-directional (pawl style)
Functions	Central hours; central minutes
Features	Double hairspring flying tourbillon
Country of Manufacture	Switzerland, Swiss made
Known Models	H. Moser & Cie Streamliner Tourbillon Vantablack (Ref: 6804-0400)

The H. Moser & Cie caliber HMC 804 is an in-house automatic tourbillon movement.

This calibre is found in the Streamliner Tourbillon Vantablack which was launched on August 24, 2022.

In H. Moser’s own words:

“The HMC 804 is an automatic tourbillon movement which counteracts the effects of gravity in two ways: the one-minute flying tourbillon, and the patented double hairspring where two identical hairsprings compensate for any positional errors.” –source

And this:

“Conceived to counteract the effects of gravity on the watch’s timekeeping precision, the tourbillon is a device in which the regulating organ and escapement are placed, which constantly rotates around a central axis to eliminate any positional errors.” -same source

Additional Resources:

• H. Moser Streamliner Tourbillon Vantablack official page
• Official video announcement