Which is cheaper, the Lum-Tec RPM or the Spinnaker Dumas GMT?

At MSRP the Spinnaker Dumas GMT is the cheaper of the two at $399, against $495 for the Lum-Tec RPM — a $96 gap before any retailer discounting.

Which is bigger, the Lum-Tec RPM or the Spinnaker Dumas GMT?

The Spinnaker Dumas GMT wears larger at 44mm versus 43mm for the Lum-Tec RPM — a 1mm difference across the dial.

Which has better water resistance, the Lum-Tec RPM or the Spinnaker Dumas GMT?

The Spinnaker Dumas GMT is rated to 300m versus 50m for the Lum-Tec RPM.

What movement does the Lum-Tec RPM run compared to the Spinnaker Dumas GMT?

The Lum-Tec RPM runs a quartz caliber, while the Spinnaker Dumas GMT runs a automatic (Seiko NH34A).

Side by side

Lum-Tec RPMvsSpinnaker Dumas GMT

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

Lum-Tec RPM

rpm-3

MSRP $495

Spinnaker Dumas GMT

dumas-gmt-automatic-ocean-blue-sp-5119-55

MSRP $399

At a glance

11 of 29 specs differ

Diameter

RPM43mm

Dumas GMT44mm

Power Reserve

RPM40h

Dumas GMT40h

Water Resistance

RPM50m

Dumas GMT300m

MSRP

RPM$495

Dumas GMT$399

Full specifications

Case

7 specs

Crystal & Dial

1 specs

Dial Color

RPM 3

Blue

Movement

2 specs

Caliber

—

Seiko NH34A

Type

Quartz

Automatic

Pricing

1 specs

MSRP

$495

$399

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Lum-Tec RPMvsSpinnaker Dumas GMT

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Full specifications

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