Omega Speedmaster X 33 Marstimer Chronograph 45mmvsSeiko Prospex Speedtimer

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Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

Speedmaster X 33 Marstimer Chronograph 45mm

Prospex Speedtimer
Diameter
45mm
42mm
Lug-to-Lug
48.5mm
lowest
49.6mm
Thickness
14.9mm
12.9mm
lowest
Water Resistance
30m
100m
highest
MSRP
$7,000
$2,200
lowest
Movement
Omega 5622
Seiko 5X83
Case
6 specsCrystal & Dial
4 specsMovement
5 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Omega Speedmaster X 33 Marstimer Chronograph 45mm for its surprisingly light titanium case, legible analog display, and the near-imperceptible second-hand tick. The unique Mars timekeeping functionality and instrument-like aesthetic are also noted as compelling aspects. However, the watch proves divisive, with some owners criticizing its 30m water resistance and aluminum bezel, and others finding the 45mm case too large. The price premium for a quartz movement and the perceived niche appeal of its Mars-specific features are also points of contention. Overall, owners and reviewers find the Omega Speedmaster X 33 Marstimer Chronograph 45mm a cool, instrument-like watch with unique functionality, though its size and quartz movement are debated.
Owners praise the Seiko Prospex SPEEDTIMER's unique dial colors, with one highlighting a red dial and another a cream and purple-gray panda. Some owners find the 39mm variants sturdy, reliable, and versatile for everyday wear. A few owners express a preference for automatic movements over the quartz caliber. One reviewer notes a price of €860/£730 for a Speedtimer variant. On balance, owners appreciate the Seiko Prospex SPEEDTIMER's distinctive design and everyday wearability, though some find the quartz movement and price points to be drawbacks.
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