Which is cheaper, the Hemel HD24 Automatic or the Seiko Astron GPS Solar 2025 Limited Edition?

At MSRP the Hemel HD24 Automatic is the cheaper of the two at $300, against $2,900 for the Seiko Astron GPS Solar 2025 Limited Edition — a $2,600 gap before any retailer discounting.

Which is bigger, the Hemel HD24 Automatic or the Seiko Astron GPS Solar 2025 Limited Edition?

The Seiko Astron GPS Solar 2025 Limited Edition wears larger at 43.4mm versus 40mm for the Hemel HD24 Automatic — a 3.4mm difference across the dial.

Which has better water resistance, the Hemel HD24 Automatic or the Seiko Astron GPS Solar 2025 Limited Edition?

The Hemel HD24 Automatic is rated to 200m versus 10m for the Seiko Astron GPS Solar 2025 Limited Edition.

What movement does the Hemel HD24 Automatic run compared to the Seiko Astron GPS Solar 2025 Limited Edition?

The Hemel HD24 Automatic runs a automatic caliber (Seiko NH38A), while the Seiko Astron GPS Solar 2025 Limited Edition runs a quartz (5X83).

Side by side

Hemel HD24 AutomaticvsSeiko Astron GPS Solar 2025 Limited Edition

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

Hemel HD24 Automatic

the-gallant

MSRP $300

Seiko Astron GPS Solar 2025 Limited Edition

ssh183j1

MSRP $2,900

At a glance

16 of 29 specs differ

Diameter

HD24 Automatic40mm

Astron GPS Solar 2025 Limited Edition43.4mm

Power Reserve

HD24 Automatic40h

Astron GPS Solar 2025 Limited Edition40h

Water Resistance

HD24 Automatic200m

Astron GPS Solar 2025 Limited Edition100m

MSRP

HD24 Automatic$300

Astron GPS Solar 2025 Limited Edition$2,900

Full specifications

Case

7 specs

Crystal & Dial

5 specs

Crystal

Domed Sapphire

Sapphire

Crystal Shape

Flat

Curved

AR Coating

Inner

Super-clear coating

Dial Color

Gallant USAF Edition

Black

Lume

None

LumiBrite on hands and index(es)

Movement

3 specs

Caliber

Seiko NH38A

5X83

Type

Automatic

Quartz

Jewels

Pricing

1 specs

MSRP

$300

$2,900

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