Seiko Prospex SpeedtimervsLongines 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.

Prospex Speedtimer

Spirit Flyback Prototype
Diameter
42.5mm
42mm
Lug-to-Lug
50mm
49.5mm
lowest
Thickness
15.1mm
lowest
17mm
Water Resistance
100m
100m
Power Reserve
45h
n/a
MSRP
$3,000
lowest
$7,400
Movement
Seiko 8R46
Longines L791.4
Case
4 specsCrystal & Dial
4 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners praise the Seiko Prospex SPEEDTIMER's gorgeous, racing-inspired design, with some finding the red dial particularly unique. However, community members are split on its value, with one owner questioning resale for a limited edition and another finding the price for a solar quartz model expensive. A reviewer noted the chronograph's compact 39mm size and attractive panda-like dial, but wished for a thinner case and improved bracelet features. Overall, owners rate the Seiko Prospex SPEEDTIMER highly for its distinctive aesthetics, though value and specific feature preferences vary among enthusiasts.
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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