Hemel HD24 AutomaticvsSeiko Prospex Sea
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Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

HD24 Automatic

Prospex Sea
Diameter
40mm
41.3mm
Lug-to-Lug
48mm
lowest
48.2mm
Thickness
13mm
12.5mm
lowest
Water Resistance
200m
300m
highest
Power Reserve
n/a
72h
MSRP
$300
lowest
$1,100
Movement
Seiko NH38
Seiko 6R55
Case
5 specsDiameter
40mm
41.3mm
Thickness
13mm
12.5mm
Lug-to-Lug
48mm
48.2mm
Material
316L Stainless Steel
Stainless Steel
Water Resistance
200m
300m
Crystal & Dial
4 specsCrystal
Domed Sapphire
Sapphire
AR Coating
n/a
Anti-reflective coating on inner surface
Dial Color
Gallant USAF Edition
n/a
Lume
None
LumiBrite on hands, index(es) and bezel
Movement
3 specsCaliber
Seiko NH38
Seiko 6R55
Power Reserve
0h
72h
Jewels
0
24
Pricing
1 specsMSRP
$300
$1,100
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