SPECS:
Manufacturer: Montres Tudor SA, Rue François Dussaud 3-7, 1211 Geneva 26, Switzerland
Reference number: 79230DK
Functions: Hours, minutes, seconds
Movement: In-house Caliber MT5602, automatic, chronometer, 28,800 vph, 25 jewels, hack mechanism, silicon balance spring, fine regulating screws on variable inertia balance, Incabloc shock absorber, power reserve = 70 hours, diameter = 31.8 mm, height = 6.5 mm
Case: PVD-coated stainless steel, uni- directional dive bezel with aluminum track, curved sapphire crystal with nonreflective coating on the inside, screw-down crown, fully threaded PVD-coated caseback, water resistant to 200 m
Strap and clasp: Black genuine leather strap, with one-sided safety folding clasp.
Rate results (Deviation in seconds per 24 hours):
Dial up    +3
Dial down     0
Crown up     +1
Crown down     +3
Crown left     +3
Crown right     -1
Greatest deviation     4
Average deviation     +1.5
Average amplitude:
Flat positions     290°
Hanging positions     252°
Dimensions: Diameter = 41 mm, height = 15.5 mm, weight = 170 g
Variations: With antiqued leather strap and additional fabric strap ($4,150)
MSRP Price: $4,475
SCORES:
Strap and clasp (max. 10 points): Superior finishing of the steel bracelet and one-sided folding clasp with safety bar; links have screw connectors, not pins. 8
Operation (5): Hack mechanism and large, grooved screw-down crown. One drawback: The bezel is di cult to use when wearing diving gloves. 4
Case (10): The steel case is water resistant to 200 meters and has a nicely ratcheting rotating bezel. The aluminum dive-time track and PVD coating are not the sturdiest solution. 8
Design (15): The black Heritage Black Bay is the sportiest, though not the most unique version of the popular dive watch. 13
Legibility (5): Reading the time is simple both day and night. Dive time is easily legible only under good lighting. 4
Wearing comfort (10): Weighing in at 170 grams, this watch is comfortable and not at all top-heavy on the steel bracelet. 9
Movement (20): The in-house movement has a sturdy design and runs with chronometer-level precision; minimal decoration 15
Rate results (10): Gain of only 1.5 seconds per day on the timing machine and on the wrist; the greatest deviation was only 4 seconds. 9
Value (15): The price of $4,475 is not too high for such a well-designed manufacture watch with highly developed robust and functional qualities. 13