Side by side
Casio EFB-730DvsSeiko Prospex SPEEDTIMER Mechanical
The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.
At a glance
15 of 29 specs differDiameter
EFB-730D40mm
Prospex SPEEDTIMER Mechanical39.5mm
Power Reserve
EFB-730D—
Prospex SPEEDTIMER Mechanical72h
Water Resistance
EFB-730D100m
Prospex SPEEDTIMER Mechanical200m
MSRP
EFB-730D$165
Prospex SPEEDTIMER Mechanical$995
Full specifications
Case
6 specsDiameter
40mm
39.5mm
Thickness
11mm
12mm
Lug-to-Lug
47mm
44.5mm
Lug Width
—
20mm
Finish
—
—
Water Resistance
100m
200m
Crystal & Dial
4 specsCrystal Shape
—
Curved
AR Coating
No
Anti-reflective coating on inner surface
Dial Color
Black
—
Lume
None
LumiBrite on hands and index(es)
Movement
4 specsCaliber
—
6R55
Type
Quartz
Automatic
Power Reserve
—
72h
Jewels
0
24
Pricing
1 specsMSRP
$165
$995
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