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2018 Omega Seamaster Diver 300m Co-Axial Master Chronometer Review

Let’s compare the Omega Seamaser Diver 300m Co-Axial to the new 2018 25th Anniverary edition of the Omega Seamaster Diver 300m Co-Axial Master Chronometer and see what has been improved.

Omega Seamaster Diver 300m Co-Axial Master Chronometer Review

What are the differences between the new Omega Seamaster Diver 300m Co-Axial MASTER CHRONOMETER and the previous versions which do not have the Master Chronometer designation?
For starters, this one has a transparent case back that lets you see the movement.

On the outside, you can see the hot new wavy pattern on the dial reminiscent of Seamaster watch featured in a 1995 James Bond film titled ‘Goldeneye’. Let’s not forget to mention a slightly larger case size of 42mm compared to the previous 41mm Seamaster. There are many new design variations and an improved helium escape valve, crown and crown guards design but that’s not what you’re here for, is it?  Let’s pop that hood and talk about what’s going on inside the watch! Shall we? By the way, if you haven't had a peek at it yet click on the video button below.

Watch the Video

To first understand the differences between the Omega Master Co-Axial caliber 8800 automatic movement that powers this new series, we should look at the self-winding movement that powered its predecessor, the Omega Caliber 2500 d. The previous Seamaster's movement had brought an innovation to the Omega Seamaster 300m collection. This was the introduction of Omega’s patented Co-Axial escapement. Thankfully, it is also a highlighted feature in the new 2018 model.

Review of the 2018 Seamaster Diver 300m Master Chronometer

What makes the Master Chronometer different from a COSC Certified Chronometer?

The latest feature to embrace the Seamaster Diver 300m family is the coveted Master Chronometer designation. What exactly does this mean for your Seamaster watch? For starters: very high precision and excellent resistance to the enemy #1 of all mechanical watches; electromagnetic frequencies (EMF).

Using the button below, see how the Master Chronometer revolutionized Omega watches.

Watch the Video

You have most likely seen the designation of Chronometer on various luxury watches before. This designation originated for marine navigators to know that their watches meet the required precision to navigate the vast oceans timing their maneuvers to perfection.

Obviously, this was well before the GPS was ever invented but to sum it up in a nutshell, a 3rd party official Swiss chronometry lab called COSC tests the movement and if it passes all their requirements, COSC issues what’s called a ‘COSC certificate’. Once the watch movement receives this certificate it can thereafter be called a COSC certified Chronometer. To pass all the testing the watch movement must show a minimum accuracy of -4/+6 seconds per day.

The COSC Chronometer designation was at one point the highest designation that an analog watch can get. The Master Chronometer, on the other hand, took the testing several steps further. Not only does Omega send all their movements (also known as calibers) to the COSC facility for testing, but once they receive the COSC certificate they send it to another 3rd party lab known as METAS (a Swiss Metrology lab). This second lab not only tests to achieve even higher accuracy than a COSC Chronometer but perform all sorts of other tests. See list below.

Tests performed by METAS:

  • METAS tests the movement for its resistance to electromagnetic interference and exposes the watch to magnetic fields with a magnetic flux density of up to 15,000 gauss or 1.5 Tesla while in 2 different positions.
  • Then they place the caliber in the watch case and test it all over again for magnetic fields of 15,000 gauss.
  • Then they expose the watch for a full 24 hours to the same intensity of electromagnetism and through daily testing ensure that the daily deviation in precision is within specs of their target.
  • They then test the watch for 96 hours to assure it stays accurate while changing the positions of the watch and expose it to environmental and temperature fluctuations.
  • Then they test the Power Reserve of the watch and make sure that it meets what is advertised.
  • Then they place the watch in 6 different positions while testing it for any deviation of accuracy which can occur when a watch is placed at certain angles which create extra drag on the caliber.
  • Then they test for any deviations while the power reserve is between one 3rd wound and fully wound.
  • Last but not least they test the water resistance to ensure that it meets the advertised amount.

Once all this METAS testing is complete, the watch now has two pedigrees; one is the Chronometer designation from COSC, the other designation is from METAS and is called a MASTER CHRONOMETER. As you can see Omega is taking their job very seriously.

Their mission is clearly to provide diving professionals with the best diving watch in 2018. These improvements to the Seamaster certainly puts them ahead of the curve.

To show special discounted pricing click on the 'Show Price' links at the bottom of the comparison list.

 black Seamasterblue Seamaster 2018 Omega Seamaster blue2018 Omega Seamaster black
Version: Previous Model Previous Model 2018 Model 2018 Model
Series: Seamaster Diver 300m Co-Axial Automatic 41mm Seamaster Diver 300m Co-Axial Automatic 41mm Seamaster Diver 300m Co-Axial Master Chronometer 42mm Seamaster Diver 300m Co-Axial Master Chronometer 42mm
Model #: 212.30.41.20.01.003 212.30.41.20.03.001 210.30.42.20.03.001 210.30.42.20.01.001
MSRP: $4,400.00 $4,400.00 $4,850.00 $4,850.00
Size: Mens Mens Mens Mens
Case Material: Stainless Steel Stainless Steel Stainless Steel Stainless Steel
Dial Color: Black Blue Blue Black
Bracelet/Strap: Stainless Steel Stainless Steel Stainless Steel Stainless Steel
Clasp Type: Push Button Folding Clasp Push Button Folding Clasp Push Button Folding Clasp Push Button Folding Clasp
Movement: Automatic Automatic Automatic Automatic
Bezel: Uni-Directional Rotating Uni-Directional Rotating Uni-Directional Rotating Uni-Directional Rotating
Crystal: Scratch Resistant Sapphire Scratch Resistant Sapphire Scratch Resistant Sapphire Scratch Resistant Sapphire
Case Back: Solid Solid Transparent Transparent
Water Resistance: 300m/1000ft 300m/1000ft 300m/1000ft 300m/1000ft
Case Diameter: 41mm 41mm 42mm 42mm

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