Hemel HD24 AutomaticvsBoldr Odyssey Freediver
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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

Odyssey Freediver
Diameter
40mm
40mm
Lug-to-Lug
48mm
48mm
Thickness
13mm
lowest
14.2mm
Water Resistance
200m
300m
highest
MSRP
$300
lowest
$649
Movement
Seiko NH38
Automatic
Case
3 specsThickness
13mm
14.2mm
Material
316L Stainless Steel
Stainless Steel
Water Resistance
200m
300m
Crystal & Dial
4 specsCrystal
Domed Sapphire
Sapphire
AR Coating
n/a
Yes
Dial Color
Gallant USAF Edition
202
Lume
None
Super-LumiNova
Movement
1 specsCaliber
Seiko NH38
n/a
Pricing
1 specsMSRP
$300
$649
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