Seiko Prospex Speedtimer Mechanical ChronographvsLongines Spirit Flyback

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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 Mechanical Chronograph at true scale

Prospex Speedtimer Mechanical Chronograph

Longines Spirit Flyback at true scale

Spirit Flyback

Diameter

42mm

42mm

Lug-to-Lug

49.5mm

49.5mm

Thickness

14.6mm

lowest

17mm

Water Resistance

100m

100m

Power Reserve

45h

n/a

MSRP

$2,500

lowest

$5,900

Movement

Seiko 8R48

Longines L791.4

Case

3 specs
Thickness
14.6mm
17mm
Lug Width
20mm
22mm
Material
Stainless Steel
Titanium

Crystal & Dial

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

Movement

3 specs
Caliber
Seiko 8R48
Longines L791.4
Power Reserve
45h
0h
Jewels
34
0

Pricing

1 specs
MSRP
$2,500
$5,900
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Reviews

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

Seiko Prospex Speedtimer Mechanical Chronograph

The Seiko Prospex SPEEDTIMER Mechanical Chronograph is praised for its handsome, heritage-inspired design and clean, balanced dial layout, enhanced by an external tachymeter bezel. Reviewers note the adequate caliber 8R48 movement, which features a vertical clutch and column wheel with MEMS technology for durability and precision. The refined bracelet offers improved comfort, and the overall package is considered good value for a well-designed chronograph with an in-house movement. Points to consider include the 4:30 date window and a thickness of 14.6mm, while the 45-hour power reserve is an area for potential improvement. On balance, reviewers rate the Seiko Prospex SPEEDTIMER Mechanical Chronograph highly for its attractive design and solid chronograph functionality at its price point.

Longines Spirit Flyback

The Longines Spirit Flyback Titanium is widely praised for its luxurious titanium finishing, attractive anthracite dial with gold and red accents, and the precise, COSC-certified L791.4 flyback chronograph movement. Owners and reviewers consistently highlight its good value and 100m water resistance. However, a significant drawback noted by multiple sources is the watch's 17mm thickness, which can make it sit tall and hinder wearability, especially under sleeves. On balance, owners and reviewers rate the Longines Spirit Flyback Titanium highly for its premium finishing and robust movement at its price point, despite concerns over its case thickness.

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