Rolex GMT-Master II vs Tudor Black Bay GMT
Ref. 126710BLNR vs Ref. M79830RB-0010
The Rolex GMT-Master II and Tudor Black Bay GMT represent one of the most compelling matchups in luxury watches — a sibling rivalry between two brands under the same parent company. With the Rolex GMT-Master II priced at $12,350 and the Tudor Black Bay GMT at $4,150, the price gap raises a critical question: does the extra investment in the pricier option deliver proportional value? We break down the specs, market performance, and flip potential to help you decide.
Price Comparison
Rolex
GMT-Master II
Tudor
Black Bay GMT
At retail, the Rolex GMT-Master II is listed at $12,350 while the Tudor Black Bay GMT comes in at $4,150. The Tudor Black Bay GMT comes in at $8,200 less — more than half the price difference — making it a significantly more accessible option. On the secondary market, the gap widens: the Rolex GMT-Master II trades around $18,500 and the Tudor Black Bay GMT around $3,735, a difference of $14,765 favoring the Tudor Black Bay GMT. This watch trades at 50% above retail on the secondary market and is trending upward — a strong indicator of collector demand. The Tudor Black Bay GMT shows a more modest market premium of -10.0%, holding steady. For investors, the Rolex GMT-Master II edges ahead with a flip potential score of 7/10 compared to 2/10.
Specifications
| Specification | Rolex GMT-Master II | Tudor Black Bay GMT |
|---|---|---|
| Case Diameter | 40mm | 41mm |
| Case Thickness | 13.1mm | 14.8mm |
| Case Material | Oystersteel | Stainless steel |
| Bezel | Cerachrom (ceramic) in black and blue | Bidirectional rotating bezel with anodized aluminium insert in burgundy and blue |
| Crystal | Sapphire with Cyclops lens | Sapphire crystal |
| Water Resistance | 100m / 330ft | 200m / 660ft |
| Movement | Rolex calibre 3285 | Tudor Calibre MT5652 |
| Movement Type | Automatic | Automatic |
| Power Reserve | 70 hours | 70 hours |
| Bracelet/Strap | Jubilee, five-piece links | Fabric NATO strap in burgundy and blue |
| Clasp | Oysterclasp with Easylink 5mm comfort extension | Buckle |
| Lug Width | 20mm | 22mm |
Key specification differences stand out between these two: The Tudor Black Bay GMT leads in water resistance (200m / 660ft vs. 100m / 330ft), and the Rolex GMT-Master II uses Oystersteel while the Tudor Black Bay GMT opts for Stainless steel. 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 Rolex GMT-Master II costs $463 versus $91 for the Tudor Black Bay GMT. For water resistance, the Tudor Black Bay GMT 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 Rolex GMT-Master II if you value stronger flip potential, better value retention. Go with the Tudor Black Bay GMT if you prioritize a lower entry price. For pure investment potential, the Rolex GMT-Master II has the edge based on current market data.
Frequently Asked Questions
Which is more affordable, the Rolex GMT-Master II or the Tudor Black Bay GMT?
The Tudor Black Bay GMT is more accessible, priced at $4,150 compared to $12,350.
Which watch is a better investment?
Based on current market data, the Rolex GMT-Master II has a higher flip potential score of 7/10, suggesting stronger investment returns. However, watch values can fluctuate based on market conditions.
Which holds its value better on the secondary market?
The Rolex GMT-Master II currently trades at 49.8% above retail, indicating strong value retention on the pre-owned market.
How do the Rolex GMT-Master II and Tudor Black Bay GMT compare in size?
The Rolex GMT-Master II measures 40mm in diameter and 13.1mm thick, while the Tudor Black Bay GMT is 41mm by 14.8mm. Water resistance differs too: 100m / 330ft versus 200m / 660ft.
What movements do these watches use?
The Rolex GMT-Master II uses the Rolex calibre 3285 with 70 hours power reserve, while the Tudor Black Bay GMT runs on the Tudor Calibre MT5652 offering 70 hours of power reserve.