Side by side

Hemel HD24 AutomaticvsSeiko Prospex Sea

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

HD24 Automatic
HemelHD24 Automatic
MSRP $300
Prospex Sea
SeikoProspex Sea
MSRP $900

At a glance

13 of 29 specs differ
Diameter
HD24 Automatic40mm
Prospex Sea41mm
Power Reserve
HD24 Automatic40h
Prospex Sea70h
Water Resistance
HD24 Automatic200m
Prospex Sea200m
MSRP
HD24 Automatic$300
Prospex Sea$900

Full specifications

Case

4 specs
Diameter
40mm
41mm
Thickness
13mm
12.3mm
Lug-to-Lug
48mm
46.9mm
Material
316L Stainless Steel
Stainless Steel

Crystal & Dial

5 specs
Crystal
Domed Sapphire
Sapphire
Crystal Shape
Flat
Curved
AR Coating
Inner
Anti-reflective coating on inner surface
Dial Color
Gallant USAF Edition
Black
Lume
None
LumiBrite on hands, index(es) and bezel

Movement

3 specs
Caliber
Seiko NH38A
6R35
Power Reserve
40h
70h
Jewels
25
24

Pricing

1 specs
MSRP
$300
$900

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