Side by side

Hamilton Jazzmaster Auto ChronovsFormex Reef 42 mm

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

What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Hamilton Jazzmaster Auto Chrono

Owners widely praise the Hamilton Jazzmaster Auto Chrono for its value and dressy yet substantial look. The H-31 or adapted 7753 movement is noted, alongside a 60-hour power reserve. Some owners prefer a 3-6-9 subdial layout or a smaller case size, and the movement's thickness makes it unsuitable for those seeking a slim watch. On balance, owners rate the Hamilton Jazzmaster Auto Chrono highly for its value and refined aesthetic.

Formex Reef 42 mm

The Formex Reef 42 mm is widely praised for its comfortable bracelet featuring a micro-adjust clasp, COSC-certified Sellita movement, and excellent build quality. Owners appreciate the gradient dial's visual appeal and the overall wearability. Some owners note the seconds hand does not perfectly align with markers, and one owner found the lugs' taper hinders third-party strap fit. The bracelet's length and sporty design are noted as limiting versatility by some. On balance, owners and reviewers rate the Formex Reef 42 mm highly for its impressive wearability and value at the price point.

At a glance

8 of 29 specs differ
Diameter
Jazzmaster Auto Chrono42mm
Reef 42 mm42mm
Power Reserve
Jazzmaster Auto Chrono60h
Reef 42 mm56h
Water Resistance
Jazzmaster Auto Chrono100m
Reef 42 mm300m
MSRP
Jazzmaster Auto Chrono$2,095
Reef 42 mm$2,414

Full specifications

Case

4 specs
Category
Chronograph
Diver
Thickness
15.23mm
11.4mm
Lug-to-Lug
0mm
47mm
Water Resistance
100m
300m

Crystal & Dial

1 specs
Lume
None
Super-LumiNova

Movement

2 specs
Caliber
H-21
Sellita SW300-1
Power Reserve
60h
56h

Pricing

1 specs
MSRP
$2,095
$2,414
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