Rolex Datejust 31 vs Tudor Heritage Black Bay Chrono
Ref. M278274-0018 vs Ref. 79350
The Rolex Datejust 31 and Tudor Heritage Black Bay Chrono 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 Heritage Black Bay Chrono at ~$5,200 (market value), 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
Heritage Black Bay Chrono
The Rolex Datejust 31 is priced at $10,750 while the Tudor Heritage Black Bay Chrono comes in at ~$5,200 (market value). On the secondary market, the gap narrows: the Rolex Datejust 31 trades around $10,000 and the Tudor Heritage Black Bay Chrono around $5,200, a difference of $4,800 favoring the Tudor Heritage Black Bay Chrono. Currently holding steady at just 7% below retail, this watch retains most of its value on the secondary market. The Tudor Heritage Black Bay Chrono commands an even stronger market premium of +10.6%, with upward momentum. For investors, the Tudor Heritage Black Bay Chrono edges ahead with a flip potential score of 5/10 compared to 3/10.
Specifications
| Specification | Rolex Datejust 31 | Tudor Heritage Black Bay Chrono |
|---|---|---|
| Case Diameter | 31mm | 41mm |
| Case Thickness | 11.3mm | 14.9mm |
| Case Material | Oystersteel and 18ct white gold | Stainless steel |
| Bezel | 18ct white gold, fluted | Fixed bezel with tachymeter scale |
| Crystal | Sapphire with Cyclops lens | Sapphire crystal |
| Water Resistance | 100m / 330ft | 200m / 660ft |
| Movement | Rolex calibre 2236 | Tudor Calibre MT5813 |
| Movement Type | Automatic | Automatic chronograph |
| Power Reserve | 55 hours | 70 hours |
| Bracelet/Strap | Jubilee, five-piece links | Stainless steel bracelet |
| Clasp | Oysterclasp with Easylink 5mm comfort extension | Folding clasp with safety catch |
| Lug Width | 16mm | 22mm |
Key specification differences stand out between these two: The Tudor Heritage Black Bay Chrono leads in water resistance (200m / 660ft vs. 100m / 330ft), and the Tudor Heritage Black Bay Chrono offers longer power reserve at 70 hours, and the Rolex Datejust 31 uses Oystersteel and 18ct white gold while the Tudor Heritage Black Bay Chrono 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 $127 for the Tudor Heritage Black Bay Chrono. For water resistance, the Tudor Heritage Black Bay Chrono delivers better value per meter of depth rating. The Tudor Heritage Black Bay Chrono offers more power reserve per dollar spent.
Which Should You Buy?
Choose the Rolex Datejust 31 if you value the Rolex heritage. Go with the Tudor Heritage Black Bay Chrono if you prioritize a lower entry price, stronger flip potential, better value retention. For pure investment potential, the Tudor Heritage Black Bay Chrono has the edge based on current market data.
Frequently Asked Questions
Which is more affordable, the Rolex Datejust 31 or the Tudor Heritage Black Bay Chrono?
The Tudor Heritage Black Bay Chrono is more accessible, priced at ~$5,200 (market value) compared to $10,750.
Which watch is a better investment?
Based on current market data, the Tudor Heritage Black Bay Chrono has a higher flip potential score of 5/10, suggesting stronger investment returns. However, watch values can fluctuate based on market conditions.
Which holds its value better on the secondary market?
The Tudor Heritage Black Bay Chrono currently trades at 10.6% above retail, indicating strong value retention on the pre-owned market.
How do the Rolex Datejust 31 and Tudor Heritage Black Bay Chrono compare in size?
The Rolex Datejust 31 measures 31mm in diameter and 11.3mm thick, while the Tudor Heritage Black Bay Chrono is 41mm by 14.9mm. 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 Heritage Black Bay Chrono runs on the Tudor Calibre MT5813 offering 70 hours of power reserve.