Side by side

Formex Reef 39.5 mmvsTudor Black Bay 58

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

Reef 39.5 mm
FormexReef 39.5 mm
MSRP $2,230
Black Bay 58
TudorBlack Bay 58
MSRP $5,350

At a glance

18 of 29 specs differ
Diameter
Reef 39.5 mm39.5mm
Black Bay 5839mm
Power Reserve
Reef 39.5 mm56h
Black Bay 5865h
Water Resistance
Reef 39.5 mm300m
Black Bay 58200m
MSRP
Reef 39.5 mm$2,230
Black Bay 58$5,350

Full specifications

Case

7 specs
Diameter
39.5mm
39mm
Thickness
11mm
11.7mm
Lug-to-Lug
45.5mm
46mm
Lug Width
22mm
20mm
Finish
Brushed and polished
Polished + Satin
Water Resistance
300m
200m
Caseback
Solid
Solid screw-down

Crystal & Dial

4 specs
Crystal Shape
Flat
AR Coating
Inner
Dial Color
Bahama Blue
Black
Lume
Super-LumiNova
None

Movement

6 specs
Caliber
Sellita SW300-1
MT5400-U
Beat Rate
28,800 vph
0 vph
Power Reserve
56h
65h
Jewels
25
0
Hacking
Yes
No
Hand-winding
Yes
No

Pricing

1 specs
MSRP
$2,230
$5,350

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What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Formex Reef 39.5 mm

The Formex Reef 39.5 mm is widely praised for its refined finishing, comfortable and well-proportioned case design, and impressive specifications for its price point, including COSC-certified Sellita SW300-1 movement and 300m water resistance. Owners and reviewers highlight the tool-less micro-adjust clasp and quick-release spring bars as practical features. Some reviewers note that the 22mm lug width feels slightly disproportionate to the smaller case, and the bracelet could benefit from more taper, though this is a point of contention for some owners who value the overall package. A prototype crown protrusion issue is noted as being addressed for production. On balance, owners and reviewers rate the Formex Reef 39.5 mm highly for its excellent value and well-executed design.

Tudor Black Bay 58

The Tudor Black Bay 58 is widely praised for its superb wearing experience, perfect proportions, and comfortable wearability, with owners anticipating it becoming a Tudor classic. Reviewers highlight its substantial, rugged build quality and significant value, rivaling more expensive timepieces. One owner notes the clasp's sharp shield as a minor annoyance.

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