Side by side

Seiko Baby AlpinistvsTimefactors Speedbird PRS-51

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

Baby Alpinist
SeikoBaby Alpinist
MSRP $725
Speedbird PRS-51
TimefactorsSpeedbird PRS-51
MSRP $436
What people say

Owners + reviewers, side by side

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

Seiko Baby Alpinist

Seiko Prospex Land owners widely praise its comfortable, sub-12mm cushion case that wears smaller than its dimensions suggest, and its sharp, attractive appearance featuring outstanding brushing and applied indices. Reviewers note its legible dial, solid movement, and 100m water resistance at a fair price, with some owners appreciating its unique combination of features. However, the stock strap is consistently described as stiff and uncomfortable, and one owner would prefer a numbered bezel over cardinal directions. Accuracy is reported around -10 seconds per day, and the internal rotating bezel's action is considered good for the price but not as refined as higher-end models. On balance, owners and reviewers rate the Seiko Prospex Land highly for its comfortable wearability and attractive finishing at its price point.

From video reviewers

The watch's bezel action is smooth and precise. The watch's lume is somewhat lacking, with the hour markers not being as bright as they'd like. Reviewers disagree on the ideal case size, with some preferring 38mm and others 41.4mm.

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

13 of 29 specs differ
Diameter
Baby Alpinist38mm
Speedbird PRS-5136mm
Power Reserve
Baby Alpinist70h
Speedbird PRS-51
Water Resistance
Baby Alpinist200m
Speedbird PRS-51100m
MSRP
Baby Alpinist$725
Speedbird PRS-51$436

Full specifications

Case

6 specs
Category
Field
Diameter
38mm
36mm
Thickness
12.9mm
11.4mm
Lug-to-Lug
46mm
42mm
Lug Width
20mm
18mm
Water Resistance
200m
100m

Crystal & Dial

3 specs
Crystal Shape
Curved
Flat
AR Coating
Anti-reflective coating on inner surface
Inner
Lume
LumiBrite on hands and index(es)
SuperLuminova X1-C3

Movement

3 specs
Caliber
6R35
Miyota 9015
Power Reserve
70h
Jewels
24
25

Pricing

1 specs
MSRP
$725
$436
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