Side by side

Hamilton Khaki Aviation Pilot Pioneer Mechanical ChronovsFormex Reef 42 mm

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

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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.

Hamilton Khaki Aviation Pilot Pioneer Mechanical Chrono

Owners and reviewers widely praise the Hamilton Khaki Aviation Pilot Pioneer Mechanical Chrono for its authentic military design, attractive dial execution, and intriguing asymmetrical case, with many appreciating its utilitarian feel and vintage vibe. The hand-wound H-51-Si movement, offering a 60-hour power reserve and accuracy around +5 to +7 seconds per day, is also noted positively, as is the satisfying feel of manual winding. Some owners find the 36mm case size light and versatile, while others note it wears larger than its dimensions suggest. However, several sources point to the mineral crystal as a drawback compared to sapphire, and the lume is generally described as weak. The included strap is frequently criticized for being too long and uncomfortable, with many preferring it on a NATO strap. On balance, owners and reviewers rate the Hamilton Khaki Aviation Pilot Pioneer Mechanical Chrono highly for its compelling vintage military aesthetic and solid value proposition.

From video reviewers

The vintage-inspired design referencing a 1970s RAF model is a shared strength. Reviewers did not reach a consensus on any weaknesses or specific points of disagreement.

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

11 of 29 specs differ
Diameter
Khaki Aviation Pilot Pioneer Mechanical Chrono40mm
Reef 42 mm42mm
Power Reserve
Khaki Aviation Pilot Pioneer Mechanical Chrono60h
Reef 42 mm56h
Water Resistance
Khaki Aviation Pilot Pioneer Mechanical Chrono100m
Reef 42 mm300m
MSRP
Khaki Aviation Pilot Pioneer Mechanical Chrono$2,445
Reef 42 mm$2,414

Full specifications

Case

5 specs
Category
Pilot
Diver
Diameter
40mm
42mm
Thickness
14.35mm
11.4mm
Lug-to-Lug
50mm
47mm
Water Resistance
100m
300m

Crystal & Dial

2 specs
Dial Color
Blue
Black
Lume
None
Super-LumiNova

Movement

3 specs
Caliber
Hamilton H-51
Sellita SW300-1
Type
Manual
Automatic
Power Reserve
60h
56h

Pricing

1 specs
MSRP
$2,445
$2,414
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