Side by side

Timefactors Speedbird PRS-51vsZelos Nova 37

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

Speedbird PRS-51
TimefactorsSpeedbird PRS-51
MSRP $436
Nova 37
ZelosNova 37
MSRP $899
What people say

Owners + reviewers, side by side

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

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.

Zelos Nova 37

Owners widely praise the Zelos Nova 37's spectacular 37mm dimensions and extremely light, thin wearability. The meteorite dial is frequently highlighted as a captivating feature, though some reviewers suggest simpler indices would improve legibility over the Arabic numerals. The watch is considered a considerable value at $1,999. On balance, owners and reviewers rate the Zelos Nova 37 highly for its excellent dimensions and dial execution at the price.

From video reviewers

The wafer-thin case and intricate dial textures are standout features. The quality of the stock leather strap is a shared concern. Reviewers differed on whether the 37mm or 38mm case size was more accurate.

At a glance

14 of 29 specs differ
Diameter
Speedbird PRS-5136mm
Nova 3737mm
Power Reserve
Speedbird PRS-51
Nova 3740h
Water Resistance
Speedbird PRS-51100m
Nova 3750m
MSRP
Speedbird PRS-51$436
Nova 37$899

Full specifications

Case

7 specs
Category
Dress
Diameter
36mm
37mm
Thickness
11.4mm
7mm
Lug-to-Lug
42mm
37mm
Lug Width
18mm
20mm
Material
Stainless Steel
316L Stainless Steel
Water Resistance
100m
50m

Crystal & Dial

3 specs
Crystal
Sapphire
Domed Sapphire
Dial Color
Black
Salmon
Lume
SuperLuminova X1-C3
None

Movement

3 specs
Caliber
Miyota 9015
ETA 7001
Type
Automatic
Manual
Power Reserve
40h

Pricing

1 specs
MSRP
$436
$899
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