Tudor Black Bay GMT Reference #: 79830RB

The Tudor Black Bay GMT (Ref. 79830RB) is powered by the Tudor Manufacture Calibre MT5652, a self-winding mechanical movement with a bidirectional rotor system and built-in architecture. 

Key specifications for this COSC-certified movement include:

• Power Reserve: Approximately 70 hours

• Frequency: 28,800 vibrations per hour (4 Hz)

• Jewels: 28

• Functions: Hours, minutes, seconds, jumping GMT (second time zone), and date

• Features: Stop-seconds for precise time setting, non-magnetic silicon balance spring, and variable inertia balance wheel

• Type: True "flyer" GMT, allowing the local hour hand to jump forward or backward without stopping the watch. 

• Case: 41mm diameter, 14.6mm thickness, 50mm lug-to-lug, stainless steel. 

• Movement: Manufacture Calibre MT5652 (COSC-certified chronometer), automatic, ~70-hour power reserve. 

• Bezel: Bidirectional rotating with red and blue "Pepsi" anodized aluminum insert (24-hour graduated). 

• Dial: Available in black or opaline silver (depending on specific production year/batch), with luminous "snowflake" hands and dot markers. 

• Bracelet: Stainless steel rivet bracelet with flip-lock clasp (fits up to ~8-inch wrist). 

• Water Resistance: 200 meters.

• Crystal: Domed sapphire.

• Functions: Hours, minutes, seconds, date at 3 o'clock, and GMT (dual time zone).