Side by side

Lum-Tec B66 Day DatevsSeiko Prospex Sea PADI Special Edition

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

B66 Day Date
Lum-TecB66 Day Date
MSRP $545
Prospex Sea PADI Special Edition
SeikoProspex Sea PADI Special Edition
MSRP $625

At a glance

14 of 29 specs differ
Diameter
B66 Day Date44mm
Prospex Sea PADI Special Edition43.8mm
Power Reserve
B66 Day Date40h
Prospex Sea PADI Special Edition41h
Water Resistance
B66 Day Date100m
Prospex Sea PADI Special Edition200m
MSRP
B66 Day Date$545
Prospex Sea PADI Special Edition$625

Full specifications

Case

6 specs
Category
Sport
Diver
Diameter
44mm
43.8mm
Thickness
—
12.8mm
Lug-to-Lug
51.5mm
48.7mm
Material
Titanium (DLC coated)
Stainless Steel
Water Resistance
100m
200m

Crystal & Dial

4 specs
Crystal
Domed Sapphire
Sapphire
AR Coating
Inner
Anti-reflective coating on inner surface
Dial Color
Standard
Black
Lume
None
LumiBrite on hands, index(es) and bezel

Movement

3 specs
Caliber
—
4R35
Power Reserve
40h
41h
Jewels
25
23

Pricing

1 specs
MSRP
$545
$625

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