Side by side

Oblvlo JM RotorvsTimefactors Speedbird PRS-51

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

JM Rotor
OblvloJM Rotor
MSRP $299
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.

Oblvlo JM Rotor

Owners widely praise the Oblvlo Star Wheel for its artistic dial, crisp finishing, and sturdy build, noting it wears well on smaller wrists due to its actual dimensions being smaller than listed. The winding action is described as smooth, though the lume is consistently flagged as weak and imprecise in darkness, and the lack of anti-glare coating is a drawback for some. On balance, owners rate the Oblvlo highly for its artistic dial and build quality at the price.

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

11 of 29 specs differ
Diameter
JM Rotor42mm
Speedbird PRS-5136mm
Power Reserve
JM Rotor42h
Speedbird PRS-51
Water Resistance
JM Rotor50m
Speedbird PRS-51100m
MSRP
JM Rotor$299
Speedbird PRS-51$436

Full specifications

Case

6 specs
Category
Sport
Diameter
42mm
36mm
Thickness
13mm
11.4mm
Lug-to-Lug
46mm
42mm
Lug Width
20mm
18mm
Water Resistance
50m
100m

Crystal & Dial

1 specs
Lume
None
SuperLuminova X1-C3

Movement

3 specs
Caliber
Miyota 8215
Miyota 9015
Power Reserve
42h
Jewels
21
25

Pricing

1 specs
MSRP
$299
$436
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