Seiko

Separated by 10 years you would think the Seiko Ceramic Bezeled Titanium 40mm case Sagarmatha SBCW021 with a Kinetic movement (Sagamartha) and the Grand Seiko Titanium Bezeled Titanium 44.2 case SBGA031 with the Spring Drive 9R65 movement (GS Diver) would have nothing in common. The Sagamartha was a Special Edition Landmaster of 300 pieces only made in 1998 in collaboration with Ken Noguchi who used the watch to climb Mount Everest to complete his record to be the youngest person to climb the seven continents highest peaks. The GS Diver was launched in 2008 as a regular production watch and a diver finished at the highest level of finishing offered by Grand Seiko. 

(When I first saw the Grand Seiko SBGA031 in pictures I thought the design of the watch was very derivative of the Rolex Submariners however after seeing the watch in real life I realized I was completely wrong. The design language of the GS Diver is pure Seiko and can be traced back to their Ref. 6215-010 Diver issued in 1967).

Even with all these differences there is a common design language to both these watches and hence the main differentiating factor to Seiko Professional watches to any other. 

The first common factor is the three faceted case design with a different finish on each facet

and the second common factor is the Crescent shaped highly polished faceted Titanium cases

Ofcourse the GS Diver is 137 grams and has a 44.2 mm case size vs. 40mm and 95 grams for the Sagarmatha. 

The GS Diver is 14mm thick vs. the Sagamartha's 16mm

Both are extremely comfortable to wear and especially in the case of the GS Diver I could wear it in any situation

More Powerful Lume on the GS Diver vs. the Sagamartha

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