Which is cheaper, the Borealis Watch Co. Caloura 300m or the Islander Greenport 39mm Dive Watch with Black and White Dial #ISL-300?

At MSRP the Borealis Watch Co. Caloura 300m is the cheaper of the two at $275, against $399 for the Islander Greenport 39mm Dive Watch with Black and White Dial #ISL-300 — a $124 gap before any retailer discounting.

Which is bigger, the Borealis Watch Co. Caloura 300m or the Islander Greenport 39mm Dive Watch with Black and White Dial #ISL-300?

The Borealis Watch Co. Caloura 300m wears larger at 42mm versus 39mm for the Islander Greenport 39mm Dive Watch with Black and White Dial #ISL-300 — a 3mm difference across the dial.

Which has better water resistance, the Borealis Watch Co. Caloura 300m or the Islander Greenport 39mm Dive Watch with Black and White Dial #ISL-300?

The Borealis Watch Co. Caloura 300m is rated to 300m versus 200m for the Islander Greenport 39mm Dive Watch with Black and White Dial #ISL-300.

What movement does the Borealis Watch Co. Caloura 300m run compared to the Islander Greenport 39mm Dive Watch with Black and White Dial #ISL-300?

Both watches run automatic movements — the Borealis Watch Co. Caloura 300m uses the NH35 and the Islander Greenport 39mm Dive Watch with Black and White Dial #ISL-300 uses the Miyota 8205.

Side by side

Borealis Watch Co. Caloura 300mvsIslander Islander Greenport 39mm Dive Watch with Black and White Dial #ISL-300

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

Borealis Watch Co.Caloura 300m

borealis-caloura-diver-watch

MSRP $275

Islander Islander Greenport 39mm Dive Watch with Black and White Dial #ISL-300

islander-greenport-39mm-dive-watch-with-black-and-white-dial-isl-300

MSRP $399

At a glance

17 of 29 specs differ

Diameter

Caloura 300m42mm

Islander Greenport 39mm Dive Watch with Black and White Dial #ISL-30039mm

Power Reserve

Caloura 300m40h

Islander Greenport 39mm Dive Watch with Black and White Dial #ISL-300—

Water Resistance

Caloura 300m300m

Islander Greenport 39mm Dive Watch with Black and White Dial #ISL-300200m

MSRP

Caloura 300m$275

Islander Greenport 39mm Dive Watch with Black and White Dial #ISL-300$399

Full specifications

Case

7 specs

Diameter

42mm

39mm

Thickness

13.9mm

13mm

Lug-to-Lug

44.20mm

0mm

Lug Width

22mm

20mm

Finish

Brushed and polished

—

Water Resistance

300m

200m

Caseback

Solid

Screw-down

Crystal & Dial

5 specs

Crystal Shape

Flat

—

AR Coating

Inner

Underside

Dial Color

Black

—

Indices

Applied

—

Lume

BGW9

None

Movement

4 specs

Caliber

NH35

Miyota 8205

Beat Rate

28,800 vph

0 vph

Power Reserve

40h

Jewels

Pricing

1 specs

MSRP

$275

$399

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