Rado Caliber R766

Brand	Rado
Caliber Number	R766
In-House?	No
Base Caliber	ETA A31.111 (based on 2892-A2 framework)
Movement Type	Automatic, self-winding mechanical
Lignes	11.5”’
Diameter	25.6mm
Height	3.85mm
Jewel Count	21
Beat Rate / Frequency	25,200 bph / 3.5 Hz
Lift Angle	Unconfirmed
Power Reserve	72 hours
Rotor Style	Ball-bearing system
Hand-Windable?	Yes
Anti-Shock Device	Nivachoc
Balance Spring	Nivachron
Hand Count	2 or 3
Functions	Central hours; central minutes; central sweeping seconds (some models are without the seconds hand); date at 6:00
Hacking Seconds?	Yes
Country of Manufacture	Switzerland, Swiss made (V8)
Known Models	Rado DiaMaster Thinline Automatic (Add your watch to the comments below…)

The Rado caliber R766 is an automatic watch movement with 21 jewels and a frequency of 3.5 Hz (25,200 beats per hour). This movement is basically an ETA caliber A31.111 with a Rado branded rotor. Rado and ETA are both controlled by the Swatch Group conglomerate of watch brands.

In Rado’s own words:

“Introducing the Rado DiaMaster Thinline Automatic: Powered by the automatic Rado calibre R766 movement, this watch seamlessly combines tradition and innovation. With an impressive 72-hour power reserve this watch ensures long duration.” -Source: Rado DiaMaster product listing

Caliber Number/Reference Number:

Although the basic calibre number is R766, Rado appears to use different movement reference numbers depending on the configuration (potentially creating caliber confusion in the watch community).

Some examples include:

• 03.766.111 – 2 hands, date at 6:00, DiaMaster Thinline Automatic (R14067166)
• 03.766.731 – 3 hands, date at 6:00, Anatom Automatic Diamonds (R10201712)
• 03.766.414 – 2 hands, date at 6:00, skeletonized with skeleton datewheel, DiaMaster Thinline (R14067176)

As you can see from the stock images on this page, some R766 movements are signed “CALIBRE R766” on the rotor and some are not. Please post yours in the comments below for comparison.

Additional Resources:

• Official Rado user manual (pdf)
• More Rado mentions