Side by side

Seiko Prospex SPEEDTIMER Seiko 145th Anniversary Limited EditionvsLongines LONGINES SPIRIT FLYBACK PROTOTYPE

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

At a glance

10 of 29 specs differ
Diameter
Prospex SPEEDTIMER Seiko 145th Anniversary Limited Edition42mm
LONGINES SPIRIT FLYBACK PROTOTYPE42mm
Power Reserve
Prospex SPEEDTIMER Seiko 145th Anniversary Limited Edition45h
LONGINES SPIRIT FLYBACK PROTOTYPE40h
Water Resistance
Prospex SPEEDTIMER Seiko 145th Anniversary Limited Edition100m
LONGINES SPIRIT FLYBACK PROTOTYPE100m
MSRP
Prospex SPEEDTIMER Seiko 145th Anniversary Limited Edition$2,500
LONGINES SPIRIT FLYBACK PROTOTYPE$7,400

Full specifications

Case

2 specs
Thickness
14.6mm
17mm
Lug Width
20mm
22mm

Crystal & Dial

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

Movement

3 specs
Caliber
8R48
L791.4
Power Reserve
45h
40h
Jewels
34
25

Pricing

1 specs
MSRP
$2,500
$7,400

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What people say

Owners + reviewers, side by side

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

Seiko Prospex SPEEDTIMER Seiko 145th Anniversary Limited Edition

Owners widely praise the Prospex SPEEDTIMER Seiko 145th Anniversary Limited Edition for its refined presence and intricate dial patterns, with some favoring its unique red dial and steel bezel over other Speedtimer models. However, some owners criticize the 24-hour subdial as useless, the date window as recessed, and the stock bracelet as difficult to fit, while others find the pushers stick out too much. One owner notes the $995 price point is high for the 6R55 movement, suggesting a lower range, though others appreciate the Seiko finishing and charm. On balance, owners rate the Prospex SPEEDTIMER Seiko 145th Anniversary Limited Edition well for its unique aesthetic and finishing, despite some functional and value concerns.

LONGINES SPIRIT FLYBACK PROTOTYPE

Owners widely praise the Longines Spirit Flyback Prototype for its attractive finishing, COSC-certified movement, and value as a flyback chronograph. Reviewers highlight its refined 39.5mm case and simplified dial, while some owners appreciate the reduced thickness and improved wearability compared to larger variants, with a lug-to-lug distance noted as potentially long for smaller wrists. The watch features a 68-hour power reserve and a bespoke L791.4 movement. However, the case thickness is a consistent point of discussion, with multiple sources citing 17mm, though some reviewers suggest thoughtful design makes it wear closer to 13.5-14mm. Owners are split on the dial's aesthetic, with some preferring previous configurations with gold subdial rings and concentric textures over the current flat matte dial and cut-off numbers. The leather strap is also noted as stiff and pinching.

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