How to spot Standard / Elaborated / Top / Chronometre Versions of 7750?

[gwallabie]

I am about to buy an ETA 7750 on ebay, could somebody tell me how to spot the different versions?
All I see usually is: 17 or 25 jewels... also before or after 2000.
Fonud this old thread: https://forum.replica-watch.info/threads/what-kind-of-eta7750-is-that.75256
but unfortunately the pictures, references are all gone.
Thanks

 

[gwallabie]

The search is on...
According to this:

WatchOtaku : ETA grades

"the ETA 7750 is only sold in Elabore, Top and Chronometer grades"
This mnakes the search a bit easier, Top and Chronometer grades are the same for me (I do not need the extra certification) so I only have to sort out the Elaboré grade ones.

It would also be helpful to know what type of ETA7750 movement will be used in TAG-Heuer watches.
Most 7750's on ebay are with a TAG-Heuer rotor...

 

[KushBandit]

Standard and Elabore grades use a Novodiac/Etachoc shock absorber. Top and Chronometer use Incabloc. This is the easiest way to tell.

Pallet jewels on a Standard and Elabore grade are Polyruby, Top and Chronometer are Red Ruby.

Balance wheel and hairspring are also different between Standard/Elabore and Top/Chronometer.

 

[gwallabie]

Standard and Elabore grades use a Novodiac/Etachoc shock absorber. Top and Chronometer use Incabloc. This is the easiest way to tell.

Pallet jewels on a Standard and Elabore grade are Polyruby, Top and Chronometer are Red Ruby.

Balance wheel and hairspring are also different between Standard/Elabore and Top/Chronometer.

Thank you - how do I identify Polyrubi vs. Red Ruby? Colour differences on pictures are sometimes not easy to tell.
Can I see the differences between balance wheels on a picture?

I checked now the 7750-pictures in a lot of ebay-deals - i have only seen Incabloc schock absorbers, also by the ones advertised as "elaboré" from Switzerland.

 

[Energo]

7750 Top and Chronometer have Balance wheel is made of the glycidur alloy. This wheel has not straight, but curly needles, as in Asian 7750

 

[gwallabie]

7750 Top and Chronometer have Balance wheel is made of the glycidur alloy. This wheel has not straight, but curly needles, as in Asian 7750

Thanks,

found only this picture - left side: normal, right side: Glucydur balance wheel?




Unfortunately it is not always easy to see the difference, if the movement was still running as the picturec was taken - you do not see it.

 

[Energo]

Top and Chronometer is always decorated with a perlage or Geneva waves.

 

[gwallabie]

Top and Chronometer is always decorated with a perlage or Geneva waves.

Thanks again, found some on ebay stated as top - but without any decorations. It seems that there are no strict rules at all.
There are a lot of TAG-Heuer Calibre 16 movements offered - also some with genova waves - but I read somewhere that TAG-Heuer uses only elaboré and no top or chronometer movements from ETA. They adjust the movements themselfs. (?)
This is nóone offer which seems to be a "top" movement with glucydur balance wheel: