Hamilton Khaki Aviation Khaki Pilot Pioneer Auto ChronovsLongines Spirit Flyback Prototype


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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.

Khaki Aviation Khaki Pilot Pioneer Auto Chrono

Spirit Flyback Prototype
Diameter
41mm
42mm
Lug-to-Lug
n/a
49.5mm
Thickness
16mm
lowest
17mm
Water Resistance
100m
100m
Power Reserve
60h
n/a
MSRP
$1,995
lowest
$7,400
Movement
Hamilton H-31
Longines L791.4
Case
3 specsCrystal & Dial
1 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Hamilton Khaki Aviation Khaki Pilot Pioneer Auto Chrono owners praise its excellent dial legibility and unique case shape, with one owner noting it as a reliable step up in quality and another stating they haven't taken it off since purchasing. Reviewers highlight its charismatic, function-forward military design and vintage inspiration. Some owners find the bezel's detents unremarkable, and one notes the mineral crystal scratches more easily than sapphire. A 72-hour power reserve is mentioned, along with a winding stop and a non-screw-down crown limiting water confidence for some. On balance, owners and reviewers rate the Hamilton Khaki Aviation Khaki Pilot Pioneer Auto Chrono highly for its distinctive vintage design and strong legibility at its price point.
Owners widely praise the Longines Spirit Flyback Prototype for its attractive finishing on the case and dial, COSC-certified L791.4 movement, and overall value as a flyback chronograph. Reviewers note its improved wearability due to a 47.4mm lug-to-lug distance and a thickness that, despite being listed as 17mm, wears closer to 13.5-14mm. However, the 17mm thickness is a significant drawback for some, making it difficult to wear under cuffs, and the leather strap is described as stiff. Owners are split on the dial's simplified look compared to previous models, with some preferring the earlier design elements. On balance, owners and reviewers rate the Longines Spirit Flyback Prototype highly for its refined finishing and value proposition, despite concerns regarding its case thickness.
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