Type of movement in Breitling for Bentley, Big date, 6.75

[watchas1]

It is advertised everywhere as A7750, but it seems that A7750 has at 6h - hour counter, 9h - second counter, 12h - minute counter, which is not the BB layout (it has date at 12h)???

It is so that A7753 is the right movement for BB? Or maybe A7750 and A7753 are interchangeable?

Edited August 13, 2010 by watchas1

[By-Tor]

It's 7750 seconds at '3 modification. Read Zigmeisters review of it:

http://www.rwgforum.com/topic/77688-movement-review-a7750-running-seconds-at-3/

[watchas1]

It's 7750 seconds at '3 modification. Read Zigmeisters review of it:

http://www.rwgforum.com/topic/77688-movement-review-a7750-running-seconds-at-3/

Is it possible to buy this version of A7750 movement with seconds at 3 modification?

I have got the reply from Somal Canada:

3LZF1/7750 13

[Bike Mike]

The other issue is the complication for the big date...this is a Asian hack job for the most part, that really is not reliable.

[watchas1]

Thanks for reply,

I have the old movement with bent balance wheel axis, so I am looking for a new movement. I could exchange the date mechanism from the old movement to the new one.

So, I guess I should buy "6-HR,9-SEC,3-MIN" version, right?

Thanks

The other issue is the complication for the big date...this is a Asian hack job for the most part, that really is not reliable.

[watchas1]

Or maybe there are more versions of A7750, that I am not aware of???

The other issue is the complication for the big date...this is a Asian hack job for the most part, that really is not reliable.

Edited September 10, 2010 by watchas1

[Bike Mike]

Or you could just have the balance replaced...much easier!

[watchas1]

Or you could just have the balance replaced...much easier!

haha, very funny

but actually it is not only the balance that is broken. Since the watch hit the ground pretty hard, many parts inside that are dead

So, how about the movement. whether that is:

6-HR,9-SEC, 3-MIN

or

6-HR,9-SEC,12-MIN.

???

[14060 or 16610?]

I just wrapped up a full service on one of these. It is indeed a highly modified A7750. But after the modifications it barely even resembles any kind of 7750 any more. The running seconds are at 3, hour totalizer at 6, and 30-minute counter is at 9, plus the big date complication as mentioned previously. Fairly complex movement if you ask me. I hadn't worked on one before and had no idea what was in store.

All in all, though, very nice watch. And with a proper service I don't foresee any movement issues. The big date complicated is actually rather simple. As long as the gears and jumper springs are clean and lubricated, I don't see why this complication would be any more prone to failure than other complications. It's really just 4 extra gears, 2 of them with staggered teeth, and a quick set wheel. It's pretty well made if you ask me.

watchas1, are you certain there are many "dead" parts inside? Have you disassembled it to any degree?

[14060 or 16610?]

Oh, forgot to mention that a standard A7750 will not work, neither will any gen ETA 7750, so forget that option right now. There are extra holes and pivots in the mainplate of this modified movement not present in either of the aforementioned mainplates.

[Dizzy]

I have one of these that went through a full service and its been running strong for years. Any A7750 will be unreliable without a serviceing. After being properly lubricated they are said to be as reliable as a swiss ETA 7750

dizz