Hamilton Khaki Field 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 Auto at true scale

Khaki Field Auto

Timefactors Speedbird PRS-51 at true scale

Speedbird PRS-51

Diameter

38mm

36mm

Lug-to-Lug

47mm

42mm

lowest

Thickness

11mm

lowest

11.4mm

Water Resistance

100m

100m

Power Reserve

80h

n/a

MSRP

$845

$436

lowest

Movement

Hamilton H-10

Miyota 9015

Case

4 specs
Diameter
38mm
36mm
Thickness
11mm
11.4mm
Lug-to-Lug
47mm
42mm
Lug Width
20mm
18mm

Crystal & Dial

1 specs
Lume
None
SuperLuminova X1-C3

Movement

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

Pricing

1 specs
MSRP
$845
$436
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Reviews

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

Hamilton Khaki Field Auto

Owners widely praise the Hamilton Khaki Field Auto for its classic military design, legibility, and versatile modern-vintage aesthetic that can be dressed up or down. Reviewers and owners alike commend its reliable H-10 automatic movement for accuracy, with one owner reporting deviations of less than one second per day, and its advertised 80-hour power reserve. The 38mm case is noted for its perfect proportions and comfortable wearability, though some find the bracelet's micro-adjustments limited and the lack of AR coating on the crystal can cause glare. On balance, owners and reviewers rate the Hamilton Khaki Field Auto highly for its value and solid build as an entry-level automatic watch.

From video reviewers

The Hamilton Khaki Field Auto's smooth and precise bezel action is a standout feature. The watch's lume brightness is somewhat lacking, which might be a drawback for those who prefer a brighter glow in the dark. Reviewers disagree on the watch's size, with one reviewer finding the 38mm to be a pleasant surprise, while the watch is also available in 42mm.

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.