7750 Chrono Question

[jiainsmith]

newbie question on the 7750 movement. I have seen many posts re problems with seconds at 6 with 3,6,9 sub-dial config due to modification. Does this same issue apply to 12,9,6 with seconds at 9, or 3,6,9 with seconds at 9 or, 9,3 with seconds at 3 or 9. Just trying to figure out if the 7750 is always modified for chronos or not and which would be best config to go for. If the 7750 always has problems, what are the other options out there that work well. Not looking to modfiy, just looking for best options off the shelf.

Thanks, Iain

[italiano17771]

all i own are chronos. never (knocking on wood) had any problems with the 6-9-12 layout with seconds at 9. 2 of the watches i own that have the 3-6-9 layout work great when i wear them, but stop randomly when im not. 1 of which has seconds at 9...the other has seconds at 3.

my suggestion would be to stick with the 6-9-12 layout with seconds at 9....this is only from my experience.

[Francisco]

newbie question on the 7750 movement. I have seen many posts re problems with seconds at 6 with 3,6,9 sub-dial config due to modification. Does this same issue apply to 12,9,6 with seconds at 9, or 3,6,9 with seconds at 9 or, 9,3 with seconds at 3 or 9. Just trying to figure out if the 7750 is always modified for chronos or not and which would be best config to go for. If the 7750 always has problems, what are the other options out there that work well. Not looking to modfiy, just looking for best options off the shelf.

Thanks, Iain

Please, take into account that there is a fix for the seconds at 6 layout. You can have a look here:

http://www.rwg.cc/members/index.php?showtopic=67644

Francisco.

[RWG Technical]

Probably the best configuration for an Asian 7750, is the 7750 configuration, that being subdials at 12-9-6.

Unlike the ETA 7750 series and modifications to move the subdials around (i.e. 7753 has 3-6-9 subdials) where the ETA maintains not only the same movement thickness, no matter the subdial layout, the ETA also maintains the datewheel just under the dial face, with no visible gap.

The Asian 7753 (3-6-9 subdials) is thicker than the 7750 series, and has a gap on the datewheel.

Functionally the only model that has had running issues, is the running seconds at 6 movement, but there seems to be some progress being made, as Francisco pointed out.

The Asian 7750, or 7753 layout is not problematic on it's own due to any design features, the 7753 only moves the minute counter from 12 to 3 on the dial face, not a big deal, and nothing that affects the running or reliability.

The biggest reason that the Asian 7750 has problems, is simply one of lack of correct servicing, dirty, over oiled, mainspring barrel packed with grease, not adjusted correctly etc, these can all be fixed and corrected during servicing.

RG

[jiainsmith]

Thanks guys. The Zigmeister does that mean best movement to have would be the ETA 7750 or ETA 7753 for both seconds placement and date. Does the ETA have problems with seconds at 6 or not bnecause of the same thickness as unmodded version?? Also any problems with the Asian 7750 with dials in the 12,9,6 seconds at 9 or 9,3 with seconds at 9 as in some of the Panerai chronos??

Thanks again

[RWG Technical]

The best movement is a Genuine ETA 7750 or 7753. There is no ETA running seconds at 6 model, it doesn't exist. If cost is no factor, then go with the ETA model.

Or you can always upgrade your A7750 (12-9-6) to an ETA7750, just like I did on my Breitling that I posted a couple of days ago.

The Asian 7750 models (all except the running seconds at 6 ones) are all fine, but all have the same lack of proper servicing as delivered. The majority of Asian 7750's have no problems and work fine as delivered, some don't and need to be serviced right away to get them to work correctly.

Any movement will need to be serviced on a regular basis to make sure it keeps working as it should, and doesn't wear out. ETA or Asian, it doesn't matter, they all need to be serviced at some point.

RG

[jiainsmith]

The best movement is a Genuine ETA 7750 or 7753. There is no ETA running seconds at 6 model, it doesn't exist. If cost is no factor, then go with the ETA model.

Or you can always upgrade your A7750 (12-9-6) to an ETA7750, just like I did on my Breitling that I posted a couple of days ago.

The Asian 7750 models (all except the running seconds at 6 ones) are all fine, but all have the same lack of proper servicing as delivered. The majority of Asian 7750's have no problems and work fine as delivered, some don't and need to be serviced right away to get them to work correctly.

Any movement will need to be serviced on a regular basis to make sure it keeps working as it should, and doesn't wear out. ETA or Asian, it doesn't matter, they all need to be serviced at some point.

RG

Are there any swiss movements out there that would run seconds at 6?? Looking the Planet ocean Chrono and the Rolex Daytona but don't want to deal with the asian 7750 issues.