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12 months in-house movement warranty

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The WatchCraze in-house warranty is only valid once the original warranty has expired. If the original or manufacturer's warranty is still active, the WatchCraze in-house warranty does not apply.

Authenticity Guaranteed

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All timepieces undergo authentication by a certified third-party horologist, accompanied by an official certificate of authenticity.

The latest evolution of Tudor’s iconic diver, the Black Bay 54 Lagoon Blue, brings refined proportions and a striking new dial color to the collection. At 37mm, this stainless steel timepiece recalls the brand’s earliest dive watches from 1954, now enhanced with a vivid lagoon blue dial and bezel insert for a modern twist. Powered by Tudor’s in-house COSC-certified Calibre MT5400 with a 70-hour power reserve, it pairs vintage charm with cutting-edge performance. Water resistant to 200 meters and offered on either a riveted steel bracelet or a sporty rubber strap, the Black Bay 54 Lagoon Blue is a perfect blend of heritage, versatility, and contemporary elegance.

Product Specifications

BRAND

TUDOR 

SKU

4239

Model

79000

circa

2025

crystal

SAPPHIRE CRYSTAL

Water Resistance

20 ATM

Power Reserve

70 HOURS

Movement Calibre

AUTOMATIC / MT5400

Bracelet

STEEL

Case

37 MM

Condition

MINT

Box Papers

BOX AND PAPERS

Warranty

5 YEARS

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