Side by side

Hamilton Khaki Field King AutovsFormex Reef 39.5 mm

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

Khaki Field King Auto
HamiltonKhaki Field King Auto
MSRP $845
Reef 39.5 mm
FormexReef 39.5 mm
MSRP $2,230

At a glance

11 of 29 specs differ
Diameter
Khaki Field King Auto40mm
Reef 39.5 mm39.5mm
Power Reserve
Khaki Field King Auto80h
Reef 39.5 mm56h
Water Resistance
Khaki Field King Auto50m
Reef 39.5 mm300m
MSRP
Khaki Field King Auto$845
Reef 39.5 mm$2,230

Full specifications

Case

6 specs
Category
Field
Diver
Diameter
40mm
39.5mm
Thickness
11.15mm
11mm
Lug-to-Lug
46mm
45.5mm
Lug Width
20mm
22mm
Water Resistance
50m
300m

Crystal & Dial

2 specs
Dial Color
Black
Bahama Blue
Lume
None
Super-LumiNova

Movement

2 specs
Caliber
H-40
Sellita SW300-1
Power Reserve
80h
56h

Pricing

1 specs
MSRP
$845
$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.

Hamilton Khaki Field King Auto

Owners and reviewers widely praise the Hamilton Khaki Field King Auto for its 80-hour power reserve, hacking capability, and snappy day-date function, with accuracy figures ranging from +1 to +5 seconds per day. The watch is also noted for its legibility, attractive dial options, and 100m water resistance. Some owners find the stock strap stiff and the case finishing lacks fine detail, while others mention the lume is decent but fades significantly after about 30 minutes. The lack of an anti-reflective coating on the sapphire crystal is a recurring point, and the crown does not feel like it fully pushes in for some. On balance, owners and reviewers rate the Hamilton Khaki Field King Auto highly for its robust feature set and value, particularly its day-date complication and extended power reserve.

From video reviewers

The 80-hour power reserve from the H-40 movement is a significant advantage. The lack of AR coating on the sapphire crystal hinders legibility in direct light, and the 50-meter water resistance is limited for a field watch. Reviewers disagreed on the watch case geometry and ergonomics, with one noting it contributed to buyer's remorse and another suggesting it should offer a comfortable fit.

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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