Sheffield Chrono IIvsSeiko 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.

Chrono II

Prospex Speedtimer
Diameter
40mm
39mm
Lug-to-Lug
48mm
45.5mm
lowest
Thickness
13mm
lowest
13.3mm
Water Resistance
100m
100m
MSRP
$248
lowest
$725
Movement
Seiko VK64
Seiko V192
Case
3 specsDiameter
40mm
39mm
Thickness
13mm
13.3mm
Lug-to-Lug
48mm
45.5mm
Crystal & Dial
4 specsCrystal Shape
n/a
Curved
AR Coating
n/a
Anti-reflective coating on inner surface
Dial Color
Blue
n/a
Lume
None
LumiBrite on hands and index(es)
Movement
3 specsCaliber
Seiko VK64
Seiko V192
Type
Meca-Quartz
Quartz
Power Reserve
n/a
0h
Pricing
1 specsMSRP
$248
$725
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