Grand Seiko Sport SLGA017 Tentagraph GMT vs Omega Speedmaster Dark Side of the Moon Vintage Black 311.92.44.51.01.006
| Specification | Grand Seiko Sport SLGA017 Tentagraph GMT | Omega Speedmaster Dark Side of the Moon Vintage Black 311.92.44.51.01.006 |
|---|---|---|
| Brand | Grand Seiko | Omega |
| Collection | Sport | Speedmaster |
| Reference | SLGA017 | 311.92.44.51.01.006 |
| Category | Chronograph | Chronograph |
| Movement Type | Spring Drive | Automatic |
| Caliber | 9RA2 | Omega 9300 |
| Power Reserve | 72h | 60h |
| Frequency | 28,800 vph | 28,800 vph |
| Case Diameter | 43.2mm | 44.2mm |
| Case Thickness | 15.3mm | 16.5mm |
| Case Material | Stainless Steel | Black Ceramic (ZrO2) |
| Crystal | Sapphire | Sapphire with anti-reflective coating |
| Water Resistance | 100m / 328ft | 50m / 164ft |
| Weight | 178g | 98g |
| MSRP | $13,000 | $12,100 |
| Market Price | $12,000 | $10,500 |
In-Depth Comparison
The Grand Seiko Sport SLGA017 Tentagraph GMT and the Omega Speedmaster Dark Side of the Moon Vintage Black 311.92.44.51.01.006 represent two compelling options in the luxury watch market. Both timepieces have earned devoted followings among collectors and enthusiasts, but they approach horology from distinctly different perspectives. Let's break down how these two watches compare across the key dimensions that matter most to buyers.
Heritage And Brand Prestige
Grand Seiko and Omega are both highly respected names in watchmaking. The Grand Seiko Sport SLGA017 Tentagraph GMT comes from Japan, while the Omega Speedmaster Dark Side of the Moon Vintage Black 311.92.44.51.01.006 originates from Switzerland. This particular Sport reference was introduced in 2024, while this Speedmaster reference debuted in 2015. The Grand Seiko Sport SLGA017 Tentagraph GMT is the newer release, potentially featuring more modern technology and finishing.
Movement And Mechanics
At the heart of the Grand Seiko Sport SLGA017 Tentagraph GMT beats the 9RA2 caliber offering a 72-hour power reserve running at 28,800 vph with 50 jewels. The Omega Speedmaster Dark Side of the Moon Vintage Black 311.92.44.51.01.006 is powered by the Omega 9300 with a 60-hour power reserve operating at 28,800 vph featuring 54 jewels. The Grand Seiko Sport SLGA017 Tentagraph GMT wins on power reserve with a 12-hour advantage, which means less frequent winding for those who rotate watches.
Dimensions And Wearability
The Grand Seiko Sport SLGA017 Tentagraph GMT features a 43.2mm case at 15.3mm thick with a 50.0mm lug-to-lug measurement, crafted in Stainless Steel. The Omega Speedmaster Dark Side of the Moon Vintage Black 311.92.44.51.01.006 comes in at 44.2mm and 16.5mm thick with 51.0mm lug-to-lug, constructed from Black Ceramic (ZrO2). The Grand Seiko Sport SLGA017 Tentagraph GMT wears more compactly on the wrist, making it potentially more suitable for smaller wrists or those who prefer understated proportions. At 98g, the Omega Speedmaster Dark Side of the Moon Vintage Black 311.92.44.51.01.006 is the lighter of the two.
Materials And Construction
The Grand Seiko Sport SLGA017 Tentagraph GMT uses a Sapphire crystal paired with a Fixed Tachymeter bezel, while the Omega Speedmaster Dark Side of the Moon Vintage Black 311.92.44.51.01.006 features Sapphire with anti-reflective coating crystal with a Fixed ceramic tachymeter bezel. On the wrist, the Grand Seiko Sport SLGA017 Tentagraph GMT comes on a Stainless Steel bracelet with Fold-over, while the Omega Speedmaster Dark Side of the Moon Vintage Black 311.92.44.51.01.006 is fitted with Leather strap with folding clasp featuring Deployant clasp.
Water Resistance And Capability
The Grand Seiko Sport SLGA017 Tentagraph GMT is rated to 100m / 328ft and the Omega Speedmaster Dark Side of the Moon Vintage Black 311.92.44.51.01.006 to 50m / 164ft. For serious diving or water activities, the Grand Seiko Sport SLGA017 Tentagraph GMT offers a meaningful advantage.
Pricing And Value
At retail, the Grand Seiko Sport SLGA017 Tentagraph GMT lists for $13,000 compared to $12,100 for the Omega Speedmaster Dark Side of the Moon Vintage Black 311.92.44.51.01.006. On the secondary market, the Grand Seiko Sport SLGA017 Tentagraph GMT trades around $12,000 while the Omega Speedmaster Dark Side of the Moon Vintage Black 311.92.44.51.01.006 commands approximately $10,500.
The Verdict
Choosing between the Grand Seiko Sport SLGA017 Tentagraph GMT and the Omega Speedmaster Dark Side of the Moon Vintage Black 311.92.44.51.01.006 ultimately comes down to personal priorities. Both watches are exceptional timepieces that will serve their owner well for generations. We recommend trying both on the wrist at an authorized dealer before making your final decision, as comfort and emotional connection are ultimately just as important as specifications.