Side by side

Oris Aquis Date Calibre 400vsFormex Reef 39.5 mm

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

Aquis Date Calibre 400
OrisAquis Date Calibre 400
MSRP $5,150
Reef 39.5 mm
FormexReef 39.5 mm
MSRP $2,230

At a glance

16 of 29 specs differ
Diameter
Aquis Date Calibre 40041.5mm
Reef 39.5 mm39.5mm
Power Reserve
Aquis Date Calibre 400120 hoursh
Reef 39.5 mm56h
Water Resistance
Aquis Date Calibre 400300m
Reef 39.5 mm300m
MSRP
Aquis Date Calibre 400$5,150
Reef 39.5 mm$2,230

Full specifications

Case

5 specs
Diameter
41.5mm
39.5mm
Thickness
11mm
Lug-to-Lug
45.5mm
Finish
Brushed and polished
Caseback
Solid

Crystal & Dial

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

Movement

5 specs
Caliber
CALIBRE 400
Sellita SW300-1
Beat Rate
4 vph
28,800 vph
Power Reserve
120 hoursh
56h
Jewels
21
25
Complications
Date
None

Pricing

1 specs
MSRP
$5,150
$2,230

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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.

Oris Aquis Date Calibre 400

The Oris Aquis Date Calibre 400 is widely lauded for its exclusive in-house movement, offering a five-day power reserve, 10-year warranty, and 10-year service interval. Reviewers and owners praise its impressive accuracy, with figures ranging from under a second per day to seven seconds fast per day. The watch features a refined case with slimmer lugs and an updated dial for improved ergonomics, a patented quick-change system for straps, and a smooth, precise bezel action. Some find the dial can be shiny with glare from the domed crystal. Overall, owners and reviewers rate the Oris Aquis Date Calibre 400 highly for its significant advancements in mechanical watchmaking and value proposition.

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.

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