Rado Caliber R734

Brand	Rado
Caliber Number	R734
Base Caliber	ETA C07.631+
Movement Type	Automatic, self-winding mechanical
Lignes	11.5”’
Diameter	25.6mm
Jewel Count	25 jewels
Beat Rate / Frequency	21,600 bph / 3 Hz
Lift Angle	Unconfirmed
Power Reserve	80 hours (3.3 days)
Hand-Windable?	Yes
Anti-Shock Device	Nivashock
Balance Spring	Nivachron
Regulator?	None
Hand Count	3
Functions	Central hours; central minutes; central sweeping seconds
Hacking Seconds?	Yes
Country of Manufacture	Switzerland, Swiss made
Known Models	Rado Captain Cook High-Tech Ceramic (Refs: R32127162, R32121752, R32128202, R32127156), Rado Centrix Automatic Open Heart (Ref: R30012152), Rado True Square Automatic Open Heart (Ref: R27073712) (Add your watch to the comments below…)

The Rado caliber R734 is a Swiss made automatic movement that is basically an ETA calibre C07.631+ with a Rado branded rotor. As part of the C07 family of Powermatic movements, it offers 80 hours of power reserve on a full wind. ETA and Rado are both part of the Swatch Group conglomerate of watch brands.

In Rado’s own words:

“At the heart of this masterpiece beats the Automatic Rado calibre R734 movement, producing impeccable precision and reliability. With an impressive 80-hour power reserve, this watch ensures uninterrupted performance. The antimagnetic Nivachron™ hairspring and adjustment in five positions further enhance its accuracy.” –Source

The R734 is a true no-date 3-hander movement. It is a skeletonized movement available in various designs. The example below is a Rado True Square Automatic Open Heart:

The R734 is also used for open-heart (aka open balance wheel) dials, as found in the Rado Centrix Automatic Open Heart:

Video:

Additional Resources:

• Rado Captain Cook (R734) brochure (pdf)