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.

Seiko Prospex Speedtimer at true scale

Prospex Speedtimer

Longines Spirit Flyback Prototype at true scale

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 specs
Diameter
42.5mm
42mm
Thickness
15.1mm
17mm
Lug-to-Lug
50mm
49.5mm
Lug Width
20mm
22mm

Crystal & Dial

4 specs
Crystal Shape
Curved
n/a
AR Coating
Anti-reflective coating on inner surface
n/a
Dial Color
n/a
Green
Lume
LumiBrite on hands and index(es)
None

Movement

3 specs
Caliber
Seiko 8R46
Longines L791.4
Power Reserve
45h
0h
Jewels
34
0

Pricing

1 specs
MSRP
$3,000
$7,400
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Reviews

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

Seiko Prospex Speedtimer

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.

Longines Spirit Flyback Prototype

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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