Side by side

Lum-Tec B64 ChronographvsSeiko Prospex Sea

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

B64 Chronograph
Lum-TecB64 Chronograph
MSRP $545
Prospex Sea
SeikoProspex Sea
MSRP $900

At a glance

16 of 29 specs differ
Diameter
B64 Chronograph44mm
Prospex Sea41mm
Power Reserve
B64 Chronograph40h
Prospex Sea70h
Water Resistance
B64 Chronograph100m
Prospex Sea200m
MSRP
B64 Chronograph$545
Prospex Sea$900

Full specifications

Case

7 specs
Category
Chronograph
Diver
Diameter
44mm
41mm
Thickness
—
12.3mm
Lug-to-Lug
51.5mm
46.9mm
Lug Width
22mm
20mm
Material
Titanium (DLC coated)
Stainless Steel
Water Resistance
100m
200m

Crystal & Dial

5 specs
Crystal
Domed Sapphire
Sapphire
Crystal Shape
Flat
Curved
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
—
6R35
Power Reserve
40h
70h
Jewels
25
24

Pricing

1 specs
MSRP
$545
$900

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