Side by side

Formex Reef 39.5 mmvsLongines SPIRIT ZULU TIME

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
SPIRIT ZULU TIME
LonginesSPIRIT ZULU TIME
MSRP $3,550

At a glance

21 of 29 specs differ
Diameter
Reef 39.5 mm39.5mm
SPIRIT ZULU TIME39mm
Power Reserve
Reef 39.5 mm56h
SPIRIT ZULU TIME72h
Water Resistance
Reef 39.5 mm300m
SPIRIT ZULU TIME100m
MSRP
Reef 39.5 mm$2,230
SPIRIT ZULU TIME$3,550

Full specifications

Case

9 specs
Category
Diver
GMT
Diameter
39.5mm
39mm
Thickness
11mm
13.5mm
Lug-to-Lug
45.5mm
46.8mm
Lug Width
22mm
21mm
Material
Stainless Steel
Ceramic
Finish
Brushed and polished
Water Resistance
300m
100m
Caseback
Solid
Screw-down case back

Crystal & Dial

4 specs
Crystal Shape
Flat
AR Coating
Inner
Both sides
Dial Color
Bahama Blue
Anthracite
Indices
Applied
Applied Arabic numerals

Movement

7 specs
Caliber
Sellita SW300-1
L844.4
Beat Rate
28,800 vph
25,200 vph
Power Reserve
56h
72h
Jewels
25
0
Hacking
Yes
No
Hand-winding
Yes
No
Complications
None
Hours, minutes, seconds and date, 24 hours hand with time zone mechanism

Pricing

1 specs
MSRP
$2,230
$3,550

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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.

Longines SPIRIT ZULU TIME

Owners widely praise the Longines Spirit Zulu Time for its excellent fit and finish, visual appeal, and value, with many preferring its thinner titanium case and color-matched date wheel. Reviewers highlight its legibility and comfortable 39mm wearability, while some owners note the bracelet could be weightier and lacks tool-less micro-adjustment. Accuracy figures range from +5 seconds per day to unspecified, and one owner reported condensation risk in hot tubs. On balance, owners and reviewers rate the Longines Spirit Zulu Time highly for its blend of tool-watch utility and segment-leading finishing at its price point.

From video reviewers

The 18k gold capped bezel insert is a notable feature, adding a touch of luxury to the watch. However, the watch's lume is not as bright as some reviewers would like, which is a drawback for those who prioritize good illumination. Reviewers disagree on the watch's functionality, with some considering it a compelling option and others feeling it doesn't quite live up to its design.

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