Side by side
Sheffield GMTvsSeiko Prospex SPEEDTIMER Mechanical
The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.
At a glance
12 of 29 specs differDiameter
GMT40mm
Prospex SPEEDTIMER Mechanical39.5mm
Power Reserve
GMT—
Prospex SPEEDTIMER Mechanical72h
Water Resistance
GMT200m
Prospex SPEEDTIMER Mechanical200m
MSRP
GMT—
Prospex SPEEDTIMER Mechanical$995
Full specifications
Case
4 specsCategory
GMT
Chronograph
Diameter
40mm
39.5mm
Thickness
13mm
12mm
Lug-to-Lug
48mm
44.5mm
Crystal & Dial
4 specsCrystal Shape
Flat
Curved
AR Coating
Inner
Anti-reflective coating on inner surface
Dial Color
Blue
Black
Lume
None
LumiBrite on hands and index(es)
Movement
3 specsCaliber
Seiko NH34
6R55
Power Reserve
—
72h
Jewels
25
24
Pricing
1 specsMSRP
—
$995
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