Side by side
Sheffield 1AvsSeiko Prospex SPEEDTIMER
The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.
At a glance
14 of 29 specs differDiameter
1A40mm
Prospex SPEEDTIMER41.4mm
Power Reserve
1A—
Prospex SPEEDTIMER40h
Water Resistance
1A200m
Prospex SPEEDTIMER100m
MSRP
1A$223
Prospex SPEEDTIMER$750
Full specifications
Case
6 specsCategory
Diver
Chronograph
Diameter
40mm
41.4mm
Thickness
12.8mm
13mm
Lug-to-Lug
46mm
45.9mm
Lug Width
20mm
21mm
Water Resistance
200m
100m
Crystal & Dial
4 specsCrystal Shape
Flat
Curved
AR Coating
Inner
Anti-reflective coating on inner surface
Dial Color
White/Blue
Black
Lume
Swiss blue lume
LumiBrite on hands and index(es)
Movement
3 specsCaliber
Seiko NH35A
V192
Type
Automatic
Quartz
Power Reserve
—
40h
Pricing
1 specsMSRP
$223
$750
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