Rolex Daytona JF A7750 29J vs A23J A23J

[roro6263]

It's not only about thickness. It's about a watch that rarely works for more than 3 months.

If you happy to spend 300 bucks on this option, please do.

If you don't use the chrono functions, you can be lucky. (Mine, once repaired, runs like a champ with his new owner). Otherwise, tic-tac, tic-tac and....boum!!:cryingbadly:

 

[DadouN16]

Did anyone had the occasion to see BP daytona? On TSWatch they say it's 14mm thick with 7750 movement. I sent an email and they replied that they do not have the watch in hands now and therefore they can't confirm the 14mm thickness.

http://www.tswatch.club/daytona/160...ded-ver_022f112412a169d2f4fd595346db887a.html

 

[Rx4Time]

I bought an A 7750 Daytona about 6 months ago. After all I read I decided to suck it up and have it serviced to ensure long life. Probably a good thing I did as the movement was dirty and under oiled. On a positive note I learned my seconds at 6 gear train is partially jewelled so now it has been serviced and properly lubed it should be fine. Remember a lot of A7750 issues were due to the seconds at 6 gear train causing excessive friction which has been solved in most newer reps. The greater issue is the conditions it is assembled under and any dirt that gets inside and the movement shipping dry as that will kill the movement. Below are a couple pics from my servicing. Ultimately I prefer the working chronograph to a roughly 2mm thinner watch. On the wrist 99% of the population would not notice either way.

 

[roro6263]

I bought an A 7750 Daytona about 6 months ago. After all I read I decided to suck it up and have it serviced to ensure long life. Probably a good thing I did as the movement was dirty and under oiled. On a positive note I learned my seconds at 6 gear train is partially jewelled so now it has been serviced and properly lubed it should be fine. Remember a lot of A7750 issues were due to the seconds at 6 gear train causing excessive friction which has been solved in most newer reps. The greater issue is the conditions it is assembled under and any dirt that gets inside and the movement shipping dry as that will kill the movement. Below are a couple pics from my servicing. Ultimately I prefer the working chronograph to a roughly 2mm thinner watch. On the wrist 99% of the population would not notice either way.

Many thanks for sharing this, mate.:thumbup:

 

[Rx4Time]

No problem. I was shocked how dirty the movement was and wanted to share my experience. After seeing this I have two other reps out for service and waterproofing. This one passed a three ATM static pressure test prior to being serviced.

 

[roro6263]

No problem. I was shocked how dirty the movement was and wanted to share my experience. After seeing this I have two other reps out for service and waterproofing. This one passed a three ATM static pressure test prior to being serviced.

Thanks again!:thumbup:

 

[xfactory]

I promise I'm really not trying to rock the boat or anything... Just feel the urge to slide in a word and a late vote for the chrono. From the secretly happy camper minority.

Just don't seem right rubbing it right up into already bummed out unlucky faces. Just don't have the heart to do it Hence we both celebrate- and suffer it in silence

We'we been warned in the strongest terms about these ticking bombs for as long as I've been lurking these woods And yet, all my bombs are ticking still, -after all these years. Unlike a few other dead swissETA's and asian clones. Not going easy on the chronos either... Just sayin'?

 

[greg325i]

If one was going to go with an A7750, which factory makes it better JF or Noob v2? Correct me if I'm wrong, but are BP and JF using the wrong clasp? From MR's pictures, Noob seems to be the only one with the circle cut out in the clasp mechanism.

Also, as far as the Noob v2 is concerned, is it Superlume like JF and BP? Are any of these A7750 movements modified with the 3 extra jewels to improve reliability, or is that something that I'd have to have a modder do?

 

[Rx4Time]

Mine came with the extra jewels installed, and to my understanding this is how they are made now so odds are you will get a high beat (28.8 k) with jewelled seconds at 6 module. Now, they still have issues with machining and there can be slippage and chronograph resetting issues.

 

[greg325i]

Mine came with the extra jewels installed, and to my understanding this is how they are made now so odds are you will get a high beat (28.8 k) with jewelled seconds at 6 module. Now, they still have issues with machining and there can be slippage and chronograph resetting issues.

Do you have a JF A7750, or a Noob v2?

 

[Rx4Time]

Do you have a JF A7750, or a Noob v2?

I purchased it from a non TD before I found the forum. If I had to guess, I would lean towards JF. I welcome any experts to chime in as I have wondered this question myself. I know I don't have the cutout on the clasp.

 

[greg325i]

I've decided that I'm going to risk the 7750 because I want a working chronograph. I'll get it cleaned, serviced and oiled to help the longevity.

Is the noob v2 or jf a better? Do they both have blue lume? Extra jewels to help longevity? Really need the advice of people who've compared them and know what they're talking about. I've been here a while but I'm brand new to Daytonas.

 

[Pianoman144]

I understand it right, that both The 7750 and A23J have a frozen second big second Hand at 12o clock? Because on every picture I See that in same position. Thanks

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[Rx4Time]

I understand it right, that both The 7750 and A23J have a frozen second big second Hand at 12o clock? Because on every picture I See that in same position. Thanks

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The A7750 version has all chronograph functions working as per gen. The 23j version has the chronograph subdials and seconds hand frozen. The only functional subdial is the seconds hand at 6.

 

[Pianoman144]

The A7750 version has all chronograph functions working as per gen. The 23j version has the chronograph subdials and seconds hand frozen. The only functional subdial is the seconds hand at 6.

Thanks for ur quick answer. That cleared my question about the chrono. But I think my question wasnt clear enough. The "normal" big second on a7750 is working like the gen clock and not be frozen like the 23j one? Because I saw pictures from the 7750 here and on every pic the big seconds stands at 12 or was this only a coincidence. Thank you very much for information.

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[Rx4Time]

The large hand is a chronograph seconds hand, so the only time it will move is when the chronograph is running. Any Daytona that has that hand moving continually is inaccurate. The constantly moving hand for normal time seconds is the subdial at the 6 position.

 

[Philypow]

Hi all sorry to go over old ground here but just read this entire thread (great info btw)

My understanding is:

The A7750 is thicker than Gen but has a working Chrono second hand.
The A23J version is thinner closer to Gen but the Chrono second hand doesn't work.

Now, reliability...
The A23J is a more reliable movement
The A7750 the Working Chrono can fail if it is over used (or used at all according to some)

Can I clarify....when the Chrono fails on the A7750, does that cause the watch to fail too or does the watch still work. (Basically leaving you with a thicker A23J?)

Any help much appreciated?

Thanks

 

[Pianoman144]

The whole watch will stop to work. Because the seconds @6 are "hard work" for the A7750 movement especally when you are using the chrono too often. The big seconds can cause high forces to the movement when reseting it to 12 position for example and the movement isnt supposed to handle such forces. Then it will break. Someone correct me if I gave false informations. Thanks

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[Rufctr2]

Just dont use the chrono too much and it should be good.
I wanted the Ceramic Daytona before to reach the Gen, so i take the first BP release.

the watch is still at 2sec/day since 6 months and i really really want the gen now

 

[Goranot]

Any updates from someone who has had a Daytona with the 7750 movement for some time in terms of reliability as hoping to purchase one after the holidays but getting advice to stay away from the 7750 movement as reliability issues with main gears even if chrono not used..

Thanks as really want to get one but don't need. a door stopper after a couple of months..3-5 year period would be acceptable