Hamilton Khaki Field King Day-DatevsTimefactors Speedbird PRS-51
lug2lug doesn't sell watches. Buy links open the brand's or seller's own site. Some links are affiliate links: lug2lug may earn a commission at no extra cost to you. Disclosures
Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.
Khaki Field King Day-Date
Speedbird PRS-51
Diameter
40mm
36mm
Lug-to-Lug
50mm
42mm
lowest
Thickness
11.8mm
11.4mm
lowest
Water Resistance
100m
100m
Power Reserve
80h
n/a
MSRP
$845
$436
lowest
Movement
Hamilton H-40
Miyota 9015
Case
4 specsCrystal & Dial
1 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Hamilton Khaki Field King Day-Date for its classic styling and 80-hour power reserve, with many finding it an excellent value. Some owners report concerns about water resistance and potential long-term durability, while others have experienced no issues over several years and deem the 10 bar rating sufficient for daily wear and swimming. Overall, owners rate the Hamilton Khaki Field King Day-Date highly for its classic style and extended power reserve at the price.
The 80-hour power reserve from the H-40 automatic movement is a significant strength. The 50-meter water resistance is considered a limitation for a field watch.
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.
Similar watches
Matched to the watches above on size, movement, style and price, microbrands first. Open any one to dig in.
Also compared
Comparisons nearby in the catalog: alternatives to the watches above paired against the matchup.