Formex Reef GMTvsTudor Black Bay GMT S&G
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Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

Reef GMT

Black Bay GMT S&G
Diameter
42mm
41mm
Lug-to-Lug
47mm
n/a
Thickness
11.4mm
lowest
14.6mm
Water Resistance
300m
highest
200m
Power Reserve
56h
70h
highest
MSRP
$2,235
n/a
Movement
Sellita SW330-2
Tudor MT5652
Case
5 specsCrystal & Dial
2 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners and reviewers widely praise the Formex Reef GMT for its impressive specifications and value, highlighting its unique porthole case shape and comfortable quick-release bracelet with on-the-fly micro-adjustment. The COSC-certified Sellita SW330-2 movement is noted for good finishing and reliable timekeeping, with a 56-hour power reserve. However, the watch's overall width and lug-to-lug span, particularly with male endlinks, are frequently cited as being too large for smaller wrists. Some reviewers also find the bezel action stiff and slippery, and the GMT model lacks a timing bezel option with lume. Overall, owners and reviewers rate the Formex Reef GMT highly for its robust construction and excellent specs at its price point.
The watch features a COSC-certified SW330-2 GMT movement, which is visible through a sapphire crystal display case back and beautifully decorated. The watch's water-resistance of up to 300m/1000ft is a notable feature. The 42mm diameter may be too large for smaller wrists.
Owners widely praise the Tudor Black Bay GMT S&G for its striking "Root Beer" aesthetic, with reviewers calling it a "fully-realized design aesthetic" that "flat-out rules," noting it looks better in person than in photos. The watch features gold-toned hands and hour markers against a matte brown and black bezel, with gold accents on the crown and bracelet center links. While the 41mm case is considered acceptable for a sports watch with its features, some owners and reviewers find the Tudor Black Bay GMT S&G to be thick and heavy, with one owner noting its weight and thickness might not suit everyone. Overall, owners and reviewers rate the Tudor Black Bay GMT S&G highly for its compelling vintage-inspired design and the value it offers.
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