Side by side

Seiko 5KXvsTimefactors Speedbird PRS-51

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

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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 5KX

Owners widely praise the Seiko 5 Sports SKX series for its strong lume and comfortable wearability, with many noting its compact feel due to a short lug-to-lug length. The NH36 movement's accuracy varies, with typical performance between +/-5 to 10 seconds per day, though some report better. A lack of screw-down crown and ISO certification are noted drawbacks for its water resistance. Some owners find the bracelet to be of cheaper construction with hollow links, and a few have reported quality control issues. The consensus is that the Seiko 5 Sports SKX series offers good value for its price, appealing to those who appreciate its tool-like nature and iconic lineage.

Timefactors Speedbird PRS-51

Owners widely praise the Timefactors Speedbird PRS-51 for its flieger design, AR sapphire crystal, and value at £200. The 36mm case is noted to wear closer to 37mm due to the dial size, and while one owner describes the 5-link bracelet as well-built but stiff, another praises its drape and articulation. Accuracy figures vary among owners, with one reporting +7 seconds per day and another around +10 seconds per day, though one owner states theirs keeps impeccable time. The Miyota 9015 movement is noted by one owner to exhibit noticeable rotor wobble. Overall, owners rate the Timefactors Speedbird PRS-51 highly for its pilot watch aesthetics and value.

At a glance

12 of 29 specs differ
Diameter
5KX42.5mm
Speedbird PRS-5136mm
Power Reserve
5KX41h
Speedbird PRS-51
Water Resistance
5KX100m
Speedbird PRS-51100m
MSRP
5KX$350
Speedbird PRS-51$436

Full specifications

Case

5 specs
Category
Diver
Diameter
42.5mm
36mm
Thickness
13.4mm
11.4mm
Lug-to-Lug
46mm
42mm
Lug Width
22mm
18mm

Crystal & Dial

3 specs
Crystal
Hardlex
Sapphire
Dial Color
Black
Lume
LumiBrite on hands and index(es)
SuperLuminova X1-C3

Movement

3 specs
Caliber
Seiko 4R36
Miyota 9015
Power Reserve
41h
Jewels
24
0

Pricing

1 specs
MSRP
$350
$436
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