Side by side

Formex Reef 39.5 mmvsSugess Seestern Heritage S436-2 BB GMT

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
Seestern Heritage S436-2 BB GMT
SugessSeestern Heritage S436-2 BB GMT
MSRP $299

At a glance

13 of 29 specs differ
Diameter
Reef 39.5 mm39.5mm
Seestern Heritage S436-2 BB GMT40mm
Power Reserve
Reef 39.5 mm56h
Seestern Heritage S436-2 BB GMT35h
Water Resistance
Reef 39.5 mm300m
Seestern Heritage S436-2 BB GMT10m
MSRP
Reef 39.5 mm$2,230
Seestern Heritage S436-2 BB GMT$299

Full specifications

Case

6 specs
Category
Diver
GMT
Diameter
39.5mm
40mm
Thickness
11mm
12.2mm
Lug-to-Lug
45.5mm
48mm
Lug Width
22mm
20mm
Water Resistance
300m
10m

Crystal & Dial

2 specs
Dial Color
Bahama Blue
Black
Lume
Super-LumiNova
Tritium

Movement

4 specs
Caliber
Sellita SW300-1
Seiko NH34
Beat Rate
28,800 vph
3 vph
Power Reserve
56h
35h
Complications
None
GMT, Moonphase, Date

Pricing

1 specs
MSRP
$2,230
$299

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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.

Sugess Seestern Heritage S436-2 BB GMT

Owners widely praise the Sugess Seestern Heritage S436-2 BB GMT for its 39mm sizing, 12mm thinness, and light yet solid feel, with many appreciating its legibility due to the matte dial, clear crystal, and strong lume, though one owner flags the lume as a weak point. The case finishing is considered excellent, and the blue dial and satin finish are favorably compared to alternatives. Some owners report issues with a loose bezel, with others finding it improved after tuning, and one owner notes the seconds hand is too short. The bracelet clasp lacks sufficient micro-adjustment and screw pins are difficult to remove. On balance, owners rate the Sugess Seestern Heritage S436-2 BB GMT highly for its comfortable wearability and attractive finishing at the price.

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