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

At MSRP the Spinnaker Dumas Automatic is the cheaper of the two at $239, against $495 for the Lum-Tec RPM — a $256 gap before any retailer discounting.

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

The Spinnaker Dumas Automatic 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 Automatic?

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

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

The Lum-Tec RPM runs a quartz caliber, while the Spinnaker Dumas Automatic runs a automatic (SII NH35A).

Side by side

Lum-Tec RPMvsSpinnaker Dumas Automatic

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 Automatic

dumas-blue-yonder-sp-5081-dd

MSRP $239

At a glance

11 of 29 specs differ

Diameter

RPM43mm

Dumas Automatic44mm

Power Reserve

RPM40h

Dumas Automatic40h

Water Resistance

RPM50m

Dumas Automatic300m

MSRP

RPM$495

Dumas Automatic$239

Full specifications

Case

7 specs

Crystal & Dial

1 specs

Dial Color

RPM 3

Blue

Movement

2 specs

Caliber

—

SII NH35A

Type

Quartz

Automatic

Pricing

1 specs

MSRP

$495

$239

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Lum-Tec RPMvsSpinnaker Dumas Automatic

At a glance

Full specifications

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