Breitling Caliber 73

ETA Caliber 251.264

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Breitling Caliber 73

Manufacturer ETA
Caliber Number 251.264
Replaces ETA caliber 251.262
Type Quartz (mechaquartz / SuperQuartz)
Diameter 13 1/4”’ (30mm)
Thickness 5mm
Battery Cell Number 394 (SR936SW)
Claimed Battery Life 5-6 years (with the chrono not running)
Jewels 27
Frequency
32’768 Hz
Stem
401-1339 (tap 10)
Hands
2.0mm hour/1.50mm minute /0.30 second / 0.80mm chrono / 3 x 0.20mm subdials  (7 hands total)
Thermocompensated?
Yes
Hacking?
Yes
COSC?
Possible, depending on the variation
Functions Hours, minutes, small seconds subdial at 6:00, 1/10 seconds at 2:00, 60 seconds central chronograph hand, 60 minutes central chronograph hand, 12 hours subdial at 10:00, split seconds chronograph function, date at 4:00
Country
Switzerland
Known Models
(add yours in the comments)

The ETA caliber 251.264 is a 27 jewels superquartz movement. It is not a Certified Chronometer (COSC), but it can be certified and they have versions that are. This movement is an upgrade or replacement for the discontinued ETA caliber 251.262.

Variations

There are four main versions of the caliber 251.264. They are all the same diameter, with the main differences being the dial layout and whether they are PowerDrive or PreciDrive.

  • 251.264 AA – A PowerDrive and PreciDrive movement
  • 251.264 AN – A PowerDrive movement
  • 251.264 BE – A PowerDrive movement
  • 251.264 BD – A PreciDrive movement
  • 251.264 IE – A PowerDrive movement
  • 251.264 HE – A PowerDrive movement

How to tell which two letter version you have? We’re still not sure. ETA only stamps them as 251.264. If you know how to tell, please let us know in the comments below and we’ll update this post.

PowerDrive and PreciDrive

From ETA:

“The PowerDrive technology integrated into all these movements controls the motor drive and increases the speed of rotation of the hands on the dial to 200 Hz, that is to say 200 hand jumps per second. It offers the manufacturer a great deal of freedom in the display combinations. This arrangement provides one more remarkable dynamic to a modern three-counter, sport-chic look that is already well known and appreciated by the general public. The PreciDrive technology integrated into a calibre will allow the watch to achieve exceptional precision of +/- 10 seconds a year, a score equivalent to a precision of 0.027 seconds a day.”

Date Setting

This movement sets time just like most other watches, with exception of the date. The date is mechanical. Instead of a typical quickset date where rotating the drown in position 1 flips the calendar wheel, the date is advanced by the hour hand jumping forward in one hour increments (similar to the Rolex GMT-Master II or quartz Omega Seamaster for example). This feature also assists in setting the second time zone.

Resetting the Chronograph Hand to Zero

If your chronograph hands are not lining up after a battery change, use the following steps to reset them back to 12:00 or zero:

  • For the 12 hour counter at 10:00, pull the crown out one click to hour hand/date setting position and press the top chronograph pusher. Each push will advance the hand forward one click, you can hold the pusher in to advance the hand faster. When the hand is lined up, press the crown back in.
  • For the 60 minute central chrono hand, similar to the steps for the 12 hour counter above, pull the crown out to hour hand/date setting position and use the bottom chronograph pusher to advance the hand until it is lined up. Push the crown back in.
  • For the 60 seconds central chronograph hand, pull the crown out 2 clicks to the time setting position. Use the top chronograph pusher to advance the hand until it is lined and push the crown in.
  • To reset the 1/10 second subdial hand at 2:00, pull the crown out 2 clicks to the time setting mode and use the bottom chronograph pusher to advance the hand until it is lined up. Push the crown back in.

The small seconds subdial at 6:00 does not need reset because it is continuously running.

Eta Caliber 251 262 Reset Chronograph To Zero

The caliber 251.264 shown here was found in a Breitling Chronospace Evo Night Mission. Breitling refers to this movement as the caliber 73 when they use it in their watches.

Replacement Prices

At the time of this post, replacement prices for the 251.264 were found online for $129.95.

Additional Resources:

Share your comments and experience with the ETA caliber 251.264 in the comments below…

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