Tudor Heritage Black Bay Dark 41mm Black PVD COSC Automatic Mens Dive Watch

Tudor Heritage Black Bay Dark reference M79230DK is a COSC chronometer-certified automatic dive watch in an all-black PVD stainless steel 41mm case and bracelet, powered by the in-house Tudor Caliber MT5602 with a 70-hour power reserve. Bracelet length 7.75 inches, adjustable.

Bezel Type: Unidirectional rotating

Bezel Color: Black PVD stainless steel with matte black aluminum disc

Bezel Feature: Red triangle marker at 12 o'clock

Crystal: Domed scratch-resistant sapphire crystal

Band Material: Brushed black PVD stainless steel

Band Color: Black

Band Length: 7.75 inches (adjustable)

Clasp: Folding deployment buckle with safety clasp

Movement: Self-winding automatic, Tudor Caliber MT5602

Certification: COSC Chronometer Officially Certified

Power Reserve: 70 hours

Frequency: 28,800 vibrations per hour

Jewels: 26

Style: Dive Watch / Sports Watch

Tudor launched the Black Bay Dark as a stealth-edition interpretation of their iconic Black Bay dive watch, presenting the entire watch — case, bracelet, bezel, and dial — in a unified all-black PVD treatment that gives the piece a distinctly tactical, military-inspired character. The Heritage Black Bay line draws direct design inspiration from Tudor's historic dive watches of the 1950s and 1960s, incorporating the signature "snowflake" hands, domed sapphire crystal, and oversized winding crown that defined Tudor's professional diving watches for the Royal Canadian Navy and other military clients. The MT5602 movement represents Tudor's entry into fully in-house manufacture, with COSC chronometer certification guaranteeing accuracy to -4/+6 seconds per day — a standard that exceeds most competitors in this price category. For collectors and enthusiasts, the Black Bay Dark represents one of the finest value propositions in the Swiss luxury sports watch segment, combining genuine in-house manufacture, COSC certification, and 200m water resistance in an instantly recognizable, historically grounded design.