Rolex Datejust 31 vs Tudor Black Bay Pro
Ref. M278274-0018 vs Ref. M79470-0001
The Rolex Datejust 31 and Tudor Black Bay Pro represent one of the most compelling matchups in luxury watches — a sibling rivalry between two brands under the same parent company. With the Rolex Datejust 31 priced at $10,750 and the Tudor Black Bay Pro at $4,475, 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
Datejust 31
Tudor
Black Bay Pro
At retail, the Rolex Datejust 31 is listed at $10,750 while the Tudor Black Bay Pro comes in at $4,475. The Tudor Black Bay Pro comes in at $6,275 less — more than half the price difference — making it a significantly more accessible option. On the secondary market, the gap narrows: the Rolex Datejust 31 trades around $10,000 and the Tudor Black Bay Pro around $4,028, a difference of $5,972 favoring the Tudor Black Bay Pro. Currently holding steady at just 7% below retail, this watch retains most of its value on the secondary market. The Tudor Black Bay Pro shows a more modest market premium of -10.0%, holding steady. For investors, the Rolex Datejust 31 edges ahead with a flip potential score of 3/10 compared to 2/10.
Specifications
| Specification | Rolex Datejust 31 | Tudor Black Bay Pro |
|---|---|---|
| Case Diameter | 31mm | 39mm |
| Case Thickness | 11.3mm | 12.3mm |
| Case Material | Oystersteel and 18ct white gold | Stainless steel |
| Bezel | 18ct white gold, fluted | Fixed bezel with 24-hour graduated scale in black |
| Crystal | Sapphire with Cyclops lens | Sapphire crystal |
| Water Resistance | 100m / 330ft | 200m / 660ft |
| Movement | Rolex calibre 2236 | Tudor Calibre MT5652 |
| Movement Type | Automatic | Automatic |
| Power Reserve | 55 hours | 70 hours |
| Bracelet/Strap | Jubilee, five-piece links | Stainless steel with riveted-style links |
| Clasp | Oysterclasp with Easylink 5mm comfort extension | Folding clasp with safety catch and micro-adjustment |
| Lug Width | 16mm | 20mm |
Key specification differences stand out between these two: The Tudor Black Bay Pro leads in water resistance (200m / 660ft vs. 100m / 330ft), and the Tudor Black Bay Pro offers longer power reserve at 70 hours, and the Rolex Datejust 31 uses Oystersteel and 18ct white gold while the Tudor Black Bay Pro opts for Stainless steel. With 8 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 Datejust 31 costs $323 versus $103 for the Tudor Black Bay Pro. For water resistance, the Tudor Black Bay Pro delivers better value per meter of depth rating. The Tudor Black Bay Pro offers more power reserve per dollar spent.
Which Should You Buy?
Choose the Rolex Datejust 31 if you value stronger flip potential, better value retention. Go with the Tudor Black Bay Pro if you prioritize a lower entry price. For pure investment potential, the Rolex Datejust 31 has the edge based on current market data.
Frequently Asked Questions
Which is more affordable, the Rolex Datejust 31 or the Tudor Black Bay Pro?
The Tudor Black Bay Pro is more accessible, priced at $4,475 compared to $10,750.
Which watch is a better investment?
Based on current market data, the Rolex Datejust 31 has a higher flip potential score of 3/10, suggesting stronger investment returns. However, watch values can fluctuate based on market conditions.
Which holds its value better on the secondary market?
The Rolex Datejust 31 currently trades at 7.0% below retail, indicating moderate value retention on the pre-owned market.
How do the Rolex Datejust 31 and Tudor Black Bay Pro compare in size?
The Rolex Datejust 31 measures 31mm in diameter and 11.3mm thick, while the Tudor Black Bay Pro is 39mm by 12.3mm. Water resistance differs too: 100m / 330ft versus 200m / 660ft.
What movements do these watches use?
The Rolex Datejust 31 uses the Rolex calibre 2236 with 55 hours power reserve, while the Tudor Black Bay Pro runs on the Tudor Calibre MT5652 offering 70 hours of power reserve.