Jump to content
When you buy through links on our site, we may earn an affiliate commission.
  • Current Donation Goals

Breitling Blackbird winding question


rionrlty

Recommended Posts

Hi guys and girls,

 

I've been on the forum for several months now and am enjoying myself, but I have run into a curious problem.  I recently purchased a Breitling Blackbird from another forum member.  It is the older model with the date that goes all the way to 39 before turning to 00 and then 01.

 

I also recently bought a 4 position watch winder and rotate 8 of my watches on it.  My research told me that the A7750 movement, which the Blackbird is powered by, was unidirectional and typically wound in a clockwise rotation, so I set it up that way on the winder.  I found it curious that when I would take the Blackbird off of the winder that it was often run down.  None of my other watches with the A7750 seemed to have this problem.

 

On a whim I decided to reverse the rotation and Voila!  This seemed to fix the problem!  Does anyone know why this particular watch with the A7750 movement would wind in the opposite direction to the others? 

 

Also, I am having a problem with the date change.  For two complete monthly cycles of the date mechanism it will both skip dates unexpectedly and also sometimes skip ahead by 10 days like from 00 to 10, or 15 to 25.  Then, on the third cycle will change correctly.  Does anyone know if this is a common problem or how to fix it. 

 

Thanks in advance for any advice on this.  rionrlty

Link to comment
Share on other sites

I recently had a Big Date on the work bench and the gear ratio is very tricky. The date should run from 01 to 31 and start again from 01.

 

Someone probably already worked on your watch and didn't know what he was doing or it happened in China.... To adjust it you need to strip it down and adjust the interconnection of the gears and date wheels.

BD3EE12E-44A2-450E-82A3-5817B209495C-262

5F1C2F6A-FDC9-496A-ADEA-2E5B743E148A-262

Link to comment
Share on other sites

If it goes to 39 it may not be a 7750 but an a21j ( but I have never seen a BB like that)

But is it is a 7750 (working chronos) and it goes to 39 then you are in a world of pain trying to get the date right. I remember doing it on mine years ago and you need a degree in algebra or a lot of time

  • Like 1
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...
Please Sign In or Sign Up