SpecStudio
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Tudor Black Bay One 31
Stock unknown
Case
- Diameter
- 31mm
- Thickness
- 9.5mm
- Material
- steel
- Water resistance
- 100m
Crystal & dial
- Crystal
- Sapphire
Movement
- Caliber
- Tudor MT5201
- Type
- Automatic
- Power reserve
- 50h
Design language
- Case shape
- round
- Dial style
- sunburst
- Bezel
- smooth_polished
- Bracelet
- metal_jubilee
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Black collection · 24 watches
6 colorways
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Retail stock & market context
Tudor on the secondhand market
+11.6%
2026 so far · +3.5% to +16.2% · 40 matched watches
+3.6% vs the index
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In a nutshell
The Tudor Black Bay One 31 is an automatic watch, with a 31mm steel case, 9.5mm thick, powered by the Tudor MT5201 movement and a 50-hour power reserve. Water resistance is rated to 100m, under a sapphire crystal.
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