Rolex Datejust 31 vs Tudor Heritage Black Bay
Ref. M278271-0006 vs Ref. 79220R
The Rolex Datejust 31 and Tudor Heritage Black Bay 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 $14,300 and the Tudor Heritage Black Bay at ~$4,800 (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
The Rolex Datejust 31 is priced at $14,300 while the Tudor Heritage Black Bay comes in at ~$4,800 (market value). On the secondary market, the gap narrows: the Rolex Datejust 31 trades around $13,585 and the Tudor Heritage Black Bay around $4,800, a difference of $8,785 favoring the Tudor Heritage Black Bay. Currently holding steady at just 5% below retail, this watch retains most of its value on the secondary market. The Tudor Heritage Black Bay commands an even stronger market premium of +47.7%, with upward momentum. For investors, the Tudor Heritage Black Bay edges ahead with a flip potential score of 7/10 compared to 4/10.
Specifications
| Specification | Rolex Datejust 31 | Tudor Heritage Black Bay |
|---|---|---|
| Case Diameter | 31mm | 41mm |
| Case Thickness | 11.3mm | 12.7mm |
| Case Material | Oystersteel and 18ct Everose gold | Stainless steel |
| Bezel | 18ct Everose gold, fluted | Unidirectional rotating bezel with anodized aluminium insert in burgundy red |
| Crystal | Sapphire with Cyclops lens | Domed sapphire crystal |
| Water Resistance | 100m / 330ft | 200m / 660ft |
| Movement | Rolex calibre 2236 | ETA 2824 |
| Movement Type | Automatic | Automatic |
| Power Reserve | 55 hours | 38 hours |
| Bracelet/Strap | Jubilee, five-piece links in Oystersteel and 18ct Everose gold | 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 leads in water resistance (200m / 660ft vs. 100m / 330ft), and the Rolex Datejust 31 offers longer power reserve at 55 hours, and the Rolex Datejust 31 uses Oystersteel and 18ct Everose gold while the Tudor Heritage Black Bay 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 $438 versus $117 for the Tudor Heritage Black Bay. For water resistance, the Tudor Heritage Black Bay delivers better value per meter of depth rating. The Tudor Heritage Black Bay 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 if you prioritize a lower entry price, stronger flip potential, better value retention. For pure investment potential, the Tudor Heritage Black Bay 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?
The Tudor Heritage Black Bay is more accessible, priced at ~$4,800 (market value) compared to $14,300.
Which watch is a better investment?
Based on current market data, the Tudor Heritage Black Bay 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 Tudor Heritage Black Bay currently trades at 47.7% above retail, indicating strong value retention on the pre-owned market.
How do the Rolex Datejust 31 and Tudor Heritage Black Bay compare in size?
The Rolex Datejust 31 measures 31mm in diameter and 11.3mm thick, while the Tudor Heritage Black Bay is 41mm by 12.7mm. 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 runs on the ETA 2824 offering 38 hours of power reserve.