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Casio EFS-S650DvsSeiko Prospex SPEEDTIMER

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

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EFS-S650D
CasioEFS-S650D
MSRP $250
See the full EFS-S650D
Prospex SPEEDTIMER
SeikoProspex SPEEDTIMER
MSRP $750
See the full Prospex SPEEDTIMER
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Buy from Seiko ↗
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At a glance

13 of 29 specs differ
Diameter
EFS-S650D40.9mm
Prospex SPEEDTIMER41.4mm
Power Reserve
EFS-S650D—
Prospex SPEEDTIMER40h
Water Resistance
EFS-S650D100m
Prospex SPEEDTIMER100m
MSRP
EFS-S650D$250
Prospex SPEEDTIMER$750

Full specifications

Case

6 specs
Diameter
40.9mm
41.4mm
Thickness
11.7mm
13mm
Lug-to-Lug
46.7mm
45.9mm
Lug Width
—
21mm
Finish
—
Brushed and polished
Caseback
—
Solid

Crystal & Dial

3 specs
Crystal Shape
Flat
Curved
AR Coating
Yes
Anti-reflective coating on inner surface
Lume
None
LumiBrite on hands and index(es)

Movement

3 specs
Caliber
—
V192
Power Reserve
—
40h
Jewels
0
25

Pricing

1 specs
MSRP
$250
$750
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