Hamilton Khaki Field Expedition AutovsTimefactors Speedbird PRS-51

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Measurements

Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

Hamilton Khaki Field Expedition Auto at true scale

Khaki Field Expedition Auto

Timefactors Speedbird PRS-51 at true scale

Speedbird PRS-51

Diameter

37mm

36mm

Lug-to-Lug

n/a

42mm

Thickness

11.4mm

11.4mm

lowest

Water Resistance

100m

100m

Power Reserve

80h

n/a

MSRP

$1,245

$436

lowest

Movement

Hamilton H-10

Miyota 9015

Case

4 specs
Diameter
37mm
36mm
Thickness
11.45mm
11.4mm
Lug-to-Lug
n/a
42mm
Lug Width
20mm
18mm

Crystal & Dial

2 specs
Dial Color
White
Black
Lume
None
SuperLuminova X1-C3

Movement

2 specs
Caliber
Hamilton H-10
Miyota 9015
Power Reserve
80h
n/a

Pricing

1 specs
MSRP
$1,245
$436
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Reviews

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

Hamilton Khaki Field Expedition Auto

Owners widely praise the Hamilton Khaki Field Expedition Auto for its robust build, clear legibility, and versatility as a "Go Anywhere, Do Anything" watch, with many appreciating its historical connection and value as an entry-level automatic. Reviewers highlight its superb value, comfortable wearability in both 37mm and 41mm sizes, and the reliable H-10 automatic movement with an 80-hour power reserve. Some owners note water ingress issues with the non-screw-down crown, while others find the watch reliable for daily wear. The compass bezel's practical utility for navigation is questioned, but it adds to the watch's tool-like appeal. Overall, owners and reviewers rate the Hamilton Khaki Field Expedition Auto highly for its robust build and value as a versatile field/sports watch.

Timefactors Speedbird PRS-51

Owners widely praise the Timefactors Speedbird PRS-51 for its value and classic pilot's watch aesthetic, noting its beautiful AR sapphire crystal and minimalistic dial. The 36mm case is described as wearing thinner than expected, though some find the 5-link bracelet stiff or heavy, while others praise its drape and articulation. Accuracy figures vary, with some reporting impeccable timekeeping and others noting deviations of +7 to +10 seconds per day from the Miyota 9015 movement. Overall, owners rate the Timefactors Speedbird PRS-51 highly for its attractive flieger design and excellent value at its price point.