Which is cheaper, the Hemel HD24 Automatic or the Seiko Astron GPS Solar 2026 Limited Edition?

At MSRP the Hemel HD24 Automatic is the cheaper of the two at $300, against $2,400 for the Seiko Astron GPS Solar 2026 Limited Edition — a $2,100 gap before any retailer discounting.

Which is bigger, the Hemel HD24 Automatic or the Seiko Astron GPS Solar 2026 Limited Edition?

The Seiko Astron GPS Solar 2026 Limited Edition wears larger at 41.2mm versus 40mm for the Hemel HD24 Automatic — a 1.2mm difference across the dial.

Which has better water resistance, the Hemel HD24 Automatic or the Seiko Astron GPS Solar 2026 Limited Edition?

The Hemel HD24 Automatic is rated to 200m versus 10m for the Seiko Astron GPS Solar 2026 Limited Edition.

What movement does the Hemel HD24 Automatic run compared to the Seiko Astron GPS Solar 2026 Limited Edition?

The Hemel HD24 Automatic runs a automatic caliber (Seiko NH38A), while the Seiko Astron GPS Solar 2026 Limited Edition runs a quartz (3X62).

Side by side

Hemel HD24 AutomaticvsSeiko Astron GPS Solar 2026 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 2026 Limited Edition

ssj039j1

MSRP $2,400

At a glance

15 of 29 specs differ

Diameter

HD24 Automatic40mm

Astron GPS Solar 2026 Limited Edition41.2mm

Power Reserve

HD24 Automatic40h

Astron GPS Solar 2026 Limited Edition40h

Water Resistance

HD24 Automatic200m

Astron GPS Solar 2026 Limited Edition100m

MSRP

HD24 Automatic$300

Astron GPS Solar 2026 Limited Edition$2,400

Full specifications

Case

7 specs

Crystal & Dial

4 specs

Crystal

Domed Sapphire

Sapphire

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

3X62

Type

Automatic

Quartz

Jewels

Pricing

1 specs

MSRP

$300

$2,400

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