Side by side

Formex Reef 39.5 mmvsTudor Pelagos Ultra

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
Pelagos Ultra
TudorPelagos Ultra
MSRP $6,900

At a glance

19 of 29 specs differ
Diameter
Reef 39.5 mm39.5mm
Pelagos Ultra40mm
Power Reserve
Reef 39.5 mm56h
Pelagos Ultra65h
Water Resistance
Reef 39.5 mm300m
Pelagos Ultra1,000m
MSRP
Reef 39.5 mm$2,230
Pelagos Ultra$6,900

Full specifications

Case

7 specs
Diameter
39.5mm
40mm
Thickness
11mm
14.5mm
Lug-to-Lug
45.5mm
46mm
Material
Stainless Steel
Titanium
Finish
Brushed and polished
Satin
Water Resistance
300m
1000m
Caseback
Solid
Solid screw-down

Crystal & Dial

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

Movement

6 specs
Caliber
Sellita SW300-1
MT5612-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
$6,900

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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 Pelagos Ultra

The Tudor Pelagos Ultra is praised for its 1000 meters of water resistance, METAS-certified Calibre MT5612-U movement, and fully lumed dial and bezel. Reviewers highlight its titanium case and self-adjusting clasp as key features. The Tudor Pelagos Ultra is slightly larger at 43mm than some other models in the line but wears comfortably. Overall, owners and reviewers rate the Tudor Pelagos Ultra highly for its technical specifications and comfortable wearability as a flagship dive watch.

From video reviewers

The Tudor Pelagos Ultra's all-titanium construction provides a lightweight and durable case. One weakness is the lack of lume brightness. Reviewers disagree on whether the helium release valve is a notable feature or a drawback for a more streamlined design.

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