Side by side
Lum-Tec B66 Day DatevsSeiko Prospex Sea
The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.
At a glance
14 of 29 specs differDiameter
B66 Day Date44mm
Prospex Sea43.8mm
Power Reserve
B66 Day Date40h
Prospex Sea41h
Water Resistance
B66 Day Date100m
Prospex Sea200m
MSRP
B66 Day Date$545
Prospex Sea$625
Full specifications
Case
6 specsCategory
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 specsCrystal
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 specsCaliber
—
4R35
Power Reserve
40h
41h
Jewels
25
23
Pricing
1 specsMSRP
$545
$625
Follow this matchup
Get a note when Lum-Tec B66 Day Date vs Seiko Prospex Sea gets more votes, a community discussion, or a price drop. No account needed.
More watches worth a look
Matched to the watches above on size, movement, style and price — microbrands first. Open any one to dig in.
People also compared
Comparisons nearby in the catalog — alternatives to the watches above paired against the matchup.
Seiko Prospex SeavsZelos Hammerhead V3 300m TitaniumZelos Crystallised TI LEvsSeiko Prospex SeaZelos Hammerhead (Tantalum LE)vsSeiko Prospex SeaSeiko Prospex SeavsYema Superman Titanium Tourbillon CMM.31 Limited EditionSpinnaker PopeyevsLum-Tec B66 Day DateSpinnaker Pineapple HousevsLum-Tec B66 Day Date