Omega Seamaster Planet Ocean 600M vs Tudor Black Bay GMT
Ref. 215.30.44.21.03.001 vs Ref. M79830RB-0001
The Omega Seamaster Planet Ocean 600M (dive watch) and Tudor Black Bay GMT (gmt / travel watch) represent different approaches to luxury watchmaking. While the Omega Seamaster Planet Ocean 600M is priced at $7,300 and the Tudor Black Bay GMT at $4,600, both offer compelling value propositions. This comparison examines their specifications, market positioning, and investment potential side by side.
Price Comparison
Omega
Seamaster Planet Ocean 600M
Tudor
Black Bay GMT
At retail, the Omega Seamaster Planet Ocean 600M is listed at $7,300 while the Tudor Black Bay GMT comes in at $4,600. At $2,700 less (59% savings), the Tudor Black Bay GMT offers a substantially lower entry point. On the secondary market, the gap narrows: the Omega Seamaster Planet Ocean 600M trades around $5,840 and the Tudor Black Bay GMT around $3,800, a difference of $2,040 favoring the Tudor Black Bay GMT. Available at 20% below retail and trending downward, this represents a buying opportunity for those comfortable with the current market position. The Tudor Black Bay GMT commands an even stronger market premium of -17.4%, though currently trending downward. Both watches score equally on flip potential at 2/10, making neither a clear investment winner over the other.
Specifications
| Specification | Omega Seamaster Planet Ocean 600M | Tudor Black Bay GMT |
|---|---|---|
| Case Diameter | 43.5mm | 41mm |
| Case Thickness | 14.41mm | 14.8mm |
| Case Material | Stainless steel | Stainless steel |
| Bezel | Blue ceramic unidirectional rotating bezel with diving scale | Bidirectional rotating bezel with anodized aluminium insert in burgundy and blue |
| Crystal | Domed sapphire crystal with anti-reflective treatment | Sapphire crystal |
| Water Resistance | 600m / 2000ft | 200m / 660ft |
| Movement | Omega Co-Axial Master Chronometer calibre 8900 | Tudor Calibre MT5652 |
| Movement Type | Automatic | Automatic |
| Power Reserve | 55 hours | 70 hours |
| Bracelet/Strap | Stainless steel bracelet | Stainless steel with riveted-style links |
| Clasp | Folding clasp with diver extension | Folding clasp with safety catch |
| Lug Width | 21mm | 22mm |
Key specification differences stand out between these two: The Omega Seamaster Planet Ocean 600M leads in water resistance (600m / 2000ft vs. 200m / 660ft), and the Tudor Black Bay GMT offers longer power reserve at 70 hours. With 7 notable spec differences in total, the choice depends on which features matter most to your use case.
Value Per Feature
Per millimeter of case diameter, the Omega Seamaster Planet Ocean 600M costs $134 versus $93 for the Tudor Black Bay GMT. For water resistance, the Omega Seamaster Planet Ocean 600M delivers better value per meter of depth rating. The Tudor Black Bay GMT offers more power reserve per dollar spent.
Which Should You Buy?
Choose the Omega Seamaster Planet Ocean 600M if you value serious diving capabilities. Go with the Tudor Black Bay GMT if you prioritize a lower entry price, better value retention.
Frequently Asked Questions
Which is more affordable, the Omega Seamaster Planet Ocean 600M or the Tudor Black Bay GMT?
The Tudor Black Bay GMT is more accessible, priced at $4,600 compared to $7,300.
Which holds its value better on the secondary market?
The Tudor Black Bay GMT currently trades at 17.4% below retail, indicating moderate value retention on the pre-owned market.
How do the Omega Seamaster Planet Ocean 600M and Tudor Black Bay GMT compare in size?
The Omega Seamaster Planet Ocean 600M measures 43.5mm in diameter and 14.41mm thick, while the Tudor Black Bay GMT is 41mm by 14.8mm. Water resistance differs too: 600m / 2000ft versus 200m / 660ft.
What movements do these watches use?
The Omega Seamaster Planet Ocean 600M uses the Omega Co-Axial Master Chronometer calibre 8900 with 55 hours power reserve, while the Tudor Black Bay GMT runs on the Tudor Calibre MT5652 offering 70 hours of power reserve.
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