Side by side

Seiko Prospex SPEEDTIMER MechanicalvsMassena LAB Uni-Racer

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

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 Mechanical

The Seiko Prospex SPEEDTIMER Mechanical is praised for its visually appealing design and comfortable wearability, with owners frequently using its chronograph function for daily tasks. Reviewers note its clean dial layout and LumiBrite treated hands and markers, and one source highlights the 72-hour power reserve of the 6R55 movement. However, some owners criticize its chronograph functionality and the 24-hour subdial. On balance, owners and reviewers rate the Seiko Prospex SPEEDTIMER Mechanical highly for its daily usability and refined aesthetics.

Massena LAB Uni-Racer

The Massena LAB Uni-Racer is praised for its refined vintage chronograph aesthetic, featuring a 39mm case with unique horizontal finishing, a GPHG-nominated hand-wound Sellita SW510 M movement, and a sector dial with a "big eye" counter. Owners and reviewers highlight its period-perfect Super-LumiNova and snailing on recessed registers, all supported by a 58-hour power reserve and 50m water resistance. On balance, owners and reviewers rate the Massena LAB Uni-Racer highly for its authentic vintage design and refined execution at its price point.

At a glance

15 of 29 specs differ
Diameter
Prospex SPEEDTIMER Mechanical39.5mm
Uni-Racer39mm
Power Reserve
Prospex SPEEDTIMER Mechanical72h
Uni-Racer58h
Water Resistance
Prospex SPEEDTIMER Mechanical200m
Uni-Racer50m
MSRP
Prospex SPEEDTIMER Mechanical$995
Uni-Racer$3,495

Full specifications

Case

5 specs
Diameter
39.5mm
39mm
Thickness
12mm
9mm
Lug-to-Lug
44.5mm
0mm
Lug Width
20mm
0mm
Water Resistance
200m
50m

Crystal & Dial

5 specs
Crystal
Sapphire
Acrylic
Crystal Shape
Curved
Domed
AR Coating
Anti-reflective coating on inner surface
No
Dial Color
White
Lume
LumiBrite on hands and index(es)
None

Movement

4 specs
Caliber
6R55
SW510 BH M Elaboré
Type
Automatic
Manual
Power Reserve
72h
58h
Jewels
24
23

Pricing

1 specs
MSRP
$995
$3,495
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