Tired of the confusion? How to Identify a 7750 movement.

[crumpdaddy]

http://www.ranfft.de/cgi-bin/bidfun-db. ... ljoux_7750

 

[roadcarver]

Thanks!

Thanks BigNasty for this quick and to the point tutorial. I thought I had the latest 7750 b1 from Andrew, but as it turns I have a regulator on it, hence I don't have the latest 28bph A7750 version!

I was wondering why the regulator moved so easy!

Oh well.. my swiss ETA 7750 is coming so my Chrono Avenger will be back on the wrist soon.

 

[JKTOWN]

Alright I'm tired of seeing these movements being inaccurately identified. Maybe it comes from ignorance so I'm here to help alleviate that issue.

There are several ways to identify a 7750 movement. We all know there are at least three different models out there of this widely used movement. So no one buys a so called Swiss movement off of Ebay or worse buys one from here I've made this quick and easy tutorial.

1. Old Asian 7750 (AKA 7750a or 7750b) which runs at 21,600 vph. I personally have had no luck with this movement. I've owned three reps thus far with this movement and all 3 had issues.

2. Genuine ETA 7750 (AKA Valjoux 7750) which runs at 28,800 vph. I've only owned one of these but it ran and reset perfectly.

3. New Asian 7750 (AKA 7750b1) which runs at 28,800 vph. I currently own 2 of these movements. Both function properly and keep excellent time but other members have reported issues. Overall seems to be a bit more reliable than the previous Asian copies.

Alright so now I hope everyone knows which movement is which by simply glancing at a few pics.

Cheers,
Jon 8)

TERRIFIC POST = Hope this answers all the questions for thr newb's- this should (hopefully) alleviate all the confusion

 

[bignasty]

Thanks for the kind comments guys!

Cheers,
Jon 8)

 

[bignasty]

Helpful and timely post!

I'm am (or was) getting ready to purchase King's Daytona 29 jewel Swiss 7750, but everything I've read refers to a 25 jewel. Is the 29 jewel a valid Swiss movement? As it comes from King I assume it is, but any helpful insight would be appreciated before I pay the higher price for this movement as opposed to her 7750b1. I put the link and one pict to the watch/movement I'm looking at below.

http://www.cclv.net/0.htm

@ Warrcraft: Not sure what is up with the 29 jewel version. Possibly it is the modified version for seconds @ 6. Possibly the additional 4 jewels are for the gears that were added to accomplish this? Either way the movement is modified to make the seconds be in the proper place. Ms. King should be able to sort out that question for you.

Sorry I couldn't help more.

Cheers,
Jon 8)

 

[Warrcraft]

Hi Jon,

I've been trying to get my question answered with "Ms. King" she does try but her English is not soooo good! I think your explanation sounds reasonable, and I've had no problems in the past with anything I've ordered from her so I think I will go for it. Again, thanks for the great info...very helpful!

 

[shyreplover]

Helpful and timely post!

I'm am (or was) getting ready to purchase King's Daytona 29 jewel Swiss 7750, but everything I've read refers to a 25 jewel. Is the 29 jewel a valid Swiss movement? As it comes from King I assume it is, but any helpful insight would be appreciated before I pay the higher price for this movement as opposed to her 7750b1. I put the link and one pict to the watch/movement I'm looking at below.

http://www.cclv.net/0.htm

ETA 7753 has 27 jewels, while 7750 is 25 jewels.
29 jewel, eh? Funky!

 

[eLiNK]

One thing, which is not clear, is if it is possible to somehow regulate the new Asian 7750 @28,800. :?:

Of course. Just because it's not got a big fancy lever doesn't mean that adjusting the tiny levers on the escapement doesn't work.

The one with the two blobs on top is the one you need to move, and not by much. If you see it move, you've moved it too far. Don't touch the other one, though. Really, don't touch it.

Good to know. Thanks.
I wonder if my watchsmith is aware of this complication
or should I inform him?

Better safe than sorry.

 

[eLiNK]

Another thing is (if I'm not mistaken) Ziggy has written once 7750b1 is not the same as the new 7750 beating at 28,800.

It seems that 7750b1 is an improven 7750 movement and
7750 @28,800 is an upgraded 7750 movement.

That does add to a confusion.

 

[pugwash]

Another thing is (if I'm not mistaken) Ziggy has written once 7750b1 is not the same as the new 7750 beating at 28,800.

This is why, as far as I can see, we should refer to the movements purely by their speed. The 7750a, b, b1 ... just confuses people when the term you're looking for is 'crap'.

7750@28 = good
7750@21 = bad, no matter which version.

 

[bignasty]

Another thing is (if I'm not mistaken) Ziggy has written once 7750b1 is not the same as the new 7750 beating at 28,800.

This is why, as far as I can see, we should refer to the movements purely by their speed. The 7750a, b, b1 ... just confuses people when the term you're looking for is 'crap'.

7750@28 = good
7750@21 = bad, no matter which version.

I second that thought. When I ask a dealer or member I always ask "Does it have the new 28,800 Asian 7750?"

I know what to look for when I receive the watch. If its not the correct movement then I take it up with the dealer.

Cheers,
Jon 8)

 

[lara.juanito]

interesting report.

thanks.

 

[Panerino]

New Bentleys

Do the new Breitling Bentley models have the updated movement? I have a Black dial and just got a new Blue dial from Eddie.

 

[frankt8242]

Re: New Bentleys

Do the new Breitling Bentley models have the updated movement? I have a Black dial and just got a new Blue dial from Eddie.

Just count how many times the sec hand moves in a second!!....6=bad...8=good!!
And by my experiences....6=REAL bad!!! [smilie=bonedemon.gif] [smilie=bonedemon.gif] [smilie=bonedemon.gif]

 

[fendushi]

I was very curious when I received my Daytona... it keeps good time, chrono always reset to zero...

Hmmm... could it be?


@bignasty
Thank you so much... now I know for sure that my new Daytona from EL has the new and improved movt...

 

[pugwash]

Re: New Bentleys

Just count how many times the sec hand moves in a second!!....6=bad...8=good!!
And by my experiences....6=REAL bad!!!

If in doubt, use a camera to count the beats.

 

[eLiNK]

One thing, which is not clear, is if it is possible to somehow regulate the new Asian 7750 @28,800. :?:

Of course. Just because it's not got a big fancy lever doesn't mean that adjusting the tiny levers on the escapement doesn't work.

The one with the two blobs on top is the one you need to move, and not by much. If you see it move, you've moved it too far. Don't touch the other one, though. Really, don't touch it.

Just to avoid misunderstanding, could you please arrow-mark the one not to be touched?

 

[sjedwardz]

Bit of an old post I know but I've got a new Bretiling with the 28k version as in the pic above.

Which way to you move the lever for + and - settings?

I know I could try trial and error but could also end up getting mighty infuriated doing it !!!

 

[dachshund]

Move the lever with double dots away from the large lever to seed up the rate (clockwise), move the lever with the two dots toward the large lever to slow down the rate (counter clockwise)

 

[Bigshooter]

Good stuff - made this a sticky.