Watch Almanac
Tudor

Black Bay Fifty-Eight Navy Blue

Ref. M79030B

Case diameter
39 mm
Manufacturer spec
Lug-to-lug
47.8 mm
Measured in a published review
Thickness
11.9 mm
Measured in a published review
Lug width
20 mm
Measured in a published review
Ideal fit
Wrist flat: 55.1 mmLug-to-lug: 47.8 mm

How the Black Bay Fifty-Eight Navy Blue wears

Its lugs reach 8.8 mm past the 39 mm case, more than the 7 mm typical across the almanac, so it wears larger than its diameter suggests.

On our fit model it sits best on wrists from 6.75" to 8" (17.1–20.3 cm); below 6.75" the lugs start to reach the edge of the wrist.

At 11.9 mm thick it is slimmer than 84% of the 142 other dive watches we've measured, so it slides under a cuff more easily than most.

Its 20 mm lug width is one of the most common strap sizes; 186 other watches here share it, so aftermarket straps are easy to find.

Will the Black Bay Fifty-Eight Navy Blue fit your wrist?

With a 47.8 mm lug-to-lug, here is how it wears across common wrist sizes. We estimate the flat top of each wrist from its circumference; measure yours for a closer answer in the fit finder.

WristFlat width (est.)Fit
6"47.2 mmLugs overhang
6.5"51.2 mmSnug, lugs near the edge
7"55.1 mmIdeal fit
7.5"59.1 mmIdeal fit
8"63 mmIdeal fit

Specifications

Reference
M79030B
Collection
Black Bay 58
Status
Discontinued
Introduced
2019
Case material
stainless steel
Crystal
sapphire
Water resistance
200 m
Bezel
unidirectional rotatable 60-minute, steel with navy blue anodised aluminium insert, silver markings
Dial
navy blue
Strap / bracelet
riveted-style stainless steel bracelet or strap
Style
Dive

Movement

Caliber
Tudor MT5402
Type
automatic
Power reserve
70 hours
Frequency
28,800 vph (4 Hz)
Jewels
27
Accuracy
COSC

2 other watches use the Tudor MT5402

Takes 20 mm straps. See other 20 mm watches and straps.

More Black Bay 58 references

Watches that wear the same size

Other watches within 1.5 mm of its lug-to-lug.

Same 20 mm lug width

All 20 mm watches

These take the same straps as the Black Bay Fifty-Eight Navy Blue.

Sources