Which is cheaper, the Lum-Tec RPM or the Seiko Astron GPS Solar 2025 Limited Edition?

At MSRP the Lum-Tec RPM is the cheaper of the two at $495, against $2,600 for the Seiko Astron GPS Solar 2025 Limited Edition — a $2,105 gap before any retailer discounting.

Which is bigger, the Lum-Tec RPM or the Seiko Astron GPS Solar 2025 Limited Edition?

The Lum-Tec RPM wears larger at 43mm versus 42mm for the Seiko Astron GPS Solar 2025 Limited Edition — a 1mm difference across the dial.

Which has better water resistance, the Lum-Tec RPM or the Seiko Astron GPS Solar 2025 Limited Edition?

The Lum-Tec RPM is rated to 50m versus 10m for the Seiko Astron GPS Solar 2025 Limited Edition.

Side by side

Lum-Tec RPMvsSeiko Astron GPS Solar 2025 Limited Edition

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

Lum-Tec RPM

rpm-3

MSRP $495

Seiko Astron GPS Solar 2025 Limited Edition

ssj029j1

MSRP $2,600

At a glance

12 of 29 specs differ

Diameter

RPM43mm

Astron GPS Solar 2025 Limited Edition42mm

Power Reserve

RPM40h

Astron GPS Solar 2025 Limited Edition40h

Water Resistance

RPM50m

Astron GPS Solar 2025 Limited Edition100m

MSRP

RPM$495

Astron GPS Solar 2025 Limited Edition$2,600

Full specifications

Case

6 specs

Crystal & Dial

3 specs

AR Coating

Inner

Super-clear coating

Dial Color

RPM 3

Black

Lume

None

LumiBrite on hands and index(es)

Movement

2 specs

Caliber

—

3X62

Jewels

Pricing

1 specs

MSRP

$495

$2,600

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