Rolex GMT-Master vs Tudor Black Bay GMT
Ref. 1675 vs Ref. M79830RB-0001
The Rolex GMT-Master 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 priced at ~$32,000 (market value) and the Tudor Black Bay GMT at $4,600, 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
Tudor
Black Bay GMT
The Rolex GMT-Master is priced at ~$32,000 (market value) while the Tudor Black Bay GMT comes in at $4,600. On the secondary market, the gap widens: the Rolex GMT-Master trades around $32,000 and the Tudor Black Bay GMT around $3,800, a difference of $28,200 favoring the Tudor Black Bay GMT. Currently trending upward at just 0% below retail, this watch retains most of its value on the secondary market. The Tudor Black Bay GMT shows a more modest market premium of -17.4%, though currently trending downward. For investors, the Rolex GMT-Master edges ahead with a flip potential score of 6/10 compared to 2/10.
Specifications
| Specification | Rolex GMT-Master | Tudor Black Bay GMT |
|---|---|---|
| Case Diameter | 40mm | 41mm |
| Case Thickness | 12.0mm | 14.8mm |
| Case Material | Stainless steel | Stainless steel |
| Bezel | Stainless steel with aluminum insert in blue and red | Bidirectional rotating bezel with anodized aluminium insert in burgundy and blue |
| Crystal | Acrylic with Cyclops lens | Sapphire crystal |
| Water Resistance | 50m / 165ft | 200m / 660ft |
| Movement | Rolex calibre 1575 | Tudor Calibre MT5652 |
| Movement Type | Automatic | Automatic |
| Power Reserve | 48 hours | 70 hours |
| Bracelet/Strap | Oyster, folded or riveted links (varies by year) | Stainless steel with riveted-style links |
| Clasp | Oyster folding clasp | Folding clasp with safety catch |
| Lug Width | 20mm | 22mm |
Key specification differences stand out between these two: The Tudor Black Bay GMT leads in water resistance (200m / 660ft vs. 50m / 165ft), 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 Rolex GMT-Master costs $800 versus $93 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 if you value a lower entry price, stronger flip potential, better value retention. Go with the Tudor Black Bay GMT if you prioritize the Tudor heritage. For pure investment potential, the Rolex GMT-Master has the edge based on current market data.
Frequently Asked Questions
Which is more affordable, the Rolex GMT-Master or the Tudor Black Bay GMT?
The Tudor Black Bay GMT is more accessible, priced at $4,600 compared to ~$32,000 (market value).
Which watch is a better investment?
Based on current market data, the Rolex GMT-Master has a higher flip potential score of 6/10, 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 currently trades at 0.0% below retail, indicating moderate value retention on the pre-owned market.
How do the Rolex GMT-Master and Tudor Black Bay GMT compare in size?
The Rolex GMT-Master measures 40mm in diameter and 12.0mm thick, while the Tudor Black Bay GMT is 41mm by 14.8mm. Water resistance differs too: 50m / 165ft versus 200m / 660ft.
What movements do these watches use?
The Rolex GMT-Master uses the Rolex calibre 1575 with 48 hours power reserve, while the Tudor Black Bay GMT runs on the Tudor Calibre MT5652 offering 70 hours of power reserve.