but with METAS -certification?

 

Essentially, yes.

 

Is the 8400/8500 movement not also METAS?

Thanks
John

 

I'm not too sure about this. I asked an Omega rep who said that some changes is actually done and that it is not exactly the same movement...

 

No. Just COSC certified, even though they are antimagnetic. METAS is an additional certifying body run by the Swiss government and Omega; only 8800, 8900, and 9900 series movements are METAS certified (i.e. if you don't get a Master Chronometer card with your watch it's not certified).

It's the same movement as the 8500G, except it goes through another 15 days of testing in addition to the 10 days with COSC. Same LiGA escapement wheel, same materials.

 

Yes and no - some parts do change between the movements, but those are related to cosmetic (text) changes on bridges and plates, and also small identification changes made to some smaller movement parts. For example, the pallet fork on the METAS watch has a small nick out of one area, or a wheel is made in a different colour...

 

Thanks, John

 

My Seamaster 300MC did not include the third card. Now I understand why. But I have to say, she keeps AMAZINGLY accurate time. Very happy

Thanks,
John

 

8900 is more anti magnetic than 8500, I believe?

 

Not the 8500G. Both are for all intents and purposes completely antimagnetic as proved by Watch Time testing the Globemaster to 60,000 gauss.

 

I thought the Globemaster had the 8900 or 8901 movements, not 8500?

 

I see the gold version has(had) a 8501 movement.

...but there seems to be a gold version with 8901 movement now.

 

Hmm. I'm confused!!!

From ablogtowatch article below:

"The 8900 shares a lot with the 8500 architecture, but, as noted, boasts anti-magnetic properties as well as the "Master" designation. The "Master" part of the name implies that it uses the non-magnetic parts, making for an extremely anti-magnetic timepiece (and of course, it is visible through the sapphire crystal caseback)."

So does the 8900 have additional anti magnetic parts in it over the 8500, or is it just tested to 15000 Gauss whereas the 8500 is tested to 1000 Gauss and the only difference is the test with there being no physical difference between the movements and the parts in the movements themselves?

 

I answered this question earlier, as backed up by Archer. The 8500G is the exact same as the 8900 minus cosmetic differences. Both movements are antimagnetic to GREATER THAN 15,000 gauss, effectively making them immune to the effects that magnetism has on a movement.

The 8500G differs from the 8500B as it has a newer escapement wheel and materials changed, mostly to Nivagauss (which is a zirconium-based Liquidmetal, afaik). 8500G movements will be labeled Master Co-axial on the dial, where 8900 and other METAS movements will be labeled Master Chronometer.

To be clear, the 8500G is still tested for magnetism. It's just not a METAS certified movement.

More information on METAS is here: https://www.omegawatches.com/planet-omega/watchmaking/the-worlds-first-master-chronometer/

This is common knowledge at this point, as METAS has been around for over two years.

 

Thanks for a helpful information

 

Is there a way to tell if an 8500 movement is a B or G other than the “Master Co-axial” on the dial?

 

Yes.

 

8500 is master co-axial.
8900 is master chronometer.
I don’t really know the technical difference but they’re both amazing movements.

 

8500 is also just chronometer on the 2nd gen PO, AT, and some DeVilles no one really cares about

 

read this, explains all:
https://wristviews.com/2018/06/diff...00a-8500b-8500g-8800-8900-co-axial-movements/