Which is cheaper, the Hemel HD24 Automatic or the Seiko Prospex Sea?

At MSRP the Hemel HD24 Automatic is the cheaper of the two at $300, against $625 for the Seiko Prospex Sea — a $325 gap before any retailer discounting.

Which is bigger, the Hemel HD24 Automatic or the Seiko Prospex Sea?

The Seiko Prospex Sea wears larger at 43.8mm versus 40mm for the Hemel HD24 Automatic — a 3.8mm difference across the dial.

Which has a longer power reserve, the Hemel HD24 Automatic or the Seiko Prospex Sea?

The Seiko Prospex Sea carries a 41-hour power reserve against 40 hours on the Hemel HD24 Automatic.

What movement does the Hemel HD24 Automatic run compared to the Seiko Prospex Sea?

Both watches run automatic movements — the Hemel HD24 Automatic uses the Seiko NH38A and the Seiko Prospex Sea uses the 4R35.

Side by side

Hemel HD24 AutomaticvsSeiko Prospex Sea

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

Hemel HD24 Automatic

the-gallant

MSRP $300

Seiko Prospex Sea

srpe37

MSRP $625

At a glance

13 of 29 specs differ

Diameter

HD24 Automatic40mm

Prospex Sea43.8mm

Power Reserve

HD24 Automatic40h

Prospex Sea41h

Water Resistance

HD24 Automatic200m

Prospex Sea200m

MSRP

HD24 Automatic$300

Prospex Sea$625

Full specifications

Case

5 specs

Diameter

40mm

43.8mm

Thickness

13mm

12.8mm

Lug-to-Lug

48mm

48.7mm

Lug Width

20mm

22mm

Material

316L Stainless Steel

Stainless Steel

Crystal & Dial

4 specs

Crystal

Domed Sapphire

Sapphire

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

4R35

Power Reserve

40h

41h

Jewels

Pricing

1 specs

MSRP

$300

$625

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Hemel HD24 AutomaticvsSeiko Prospex Sea

At a glance

Full specifications

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