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 $2,900 for the Seiko Astron GPS Solar 2025 Limited Edition — a $2,405 gap before any retailer discounting.

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

The Seiko Astron GPS Solar 2025 Limited Edition wears larger at 43.4mm versus 43mm for the Lum-Tec RPM — a 0.4mm 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

ssh183j1

MSRP $2,900

At a glance

12 of 29 specs differ

Diameter

RPM43mm

Astron GPS Solar 2025 Limited Edition43.4mm

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$2,900

Full specifications

Case

5 specs

Diameter

43mm

43.4mm

Thickness

12.3mm

13.4mm

Lug-to-Lug

41mm

49.5mm

Lug Width

20mm

14mm

Water Resistance

50m

100m

Crystal & Dial

4 specs

Crystal Shape

Flat

Curved

AR Coating

Inner

Super-clear coating

Dial Color

RPM 3

Black

Lume

None

LumiBrite on hands and index(es)

Movement

2 specs

Caliber

—

5X83

Jewels

Pricing

1 specs

MSRP

$495

$2,900

Follow this matchup

Get a note when Lum-Tec RPM vs Seiko Astron GPS Solar 2025 Limited Edition gets more votes, a community discussion, or a price drop. No account needed.

Keep exploring