Which is cheaper, the Borealis Watch Co. Caloura 300m or the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

At MSRP the Borealis Watch Co. Caloura 300m is the cheaper of the two at $275, against $1,350 for the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition — a $1,075 gap before any retailer discounting.

Which is bigger, the Borealis Watch Co. Caloura 300m or the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

The Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition wears larger at 42.7mm versus 42mm for the Borealis Watch Co. Caloura 300m — a 0.7mm difference across the dial.

Which has better water resistance, the Borealis Watch Co. Caloura 300m or the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

The Borealis Watch Co. Caloura 300m is rated to 300m versus 200m for the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition.

Which has a longer power reserve, the Borealis Watch Co. Caloura 300m or the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

The Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition carries a 70-hour power reserve against 40 hours on the Borealis Watch Co. Caloura 300m.

What movement does the Borealis Watch Co. Caloura 300m run compared to the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

Both watches run automatic movements — the Borealis Watch Co. Caloura 300m uses the NH35 and the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition uses the 6R35.

Side by side

Borealis Watch Co. Caloura 300mvsSeiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition

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

Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition

spb301j1

MSRP $1,350

At a glance

12 of 29 specs differ

Diameter

Caloura 300m42mm

Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition42.7mm

Power Reserve

Caloura 300m40h

Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition70h

Water Resistance

Caloura 300m300m

Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition200m

MSRP

Caloura 300m$275

Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition$1,350

Full specifications

Case

5 specs

Diameter

42mm

42.7mm

Thickness

13.9mm

13.2mm

Lug-to-Lug

44.20mm

46.4mm

Lug Width

22mm

20mm

Water Resistance

300m

200m

Crystal & Dial

3 specs

Crystal Shape

Flat

Curved

AR Coating

Inner

Anti-reflective coating on inner surface

Lume

BGW9

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

NH35

6R35

Power Reserve

40h

70h

Jewels

Pricing

1 specs

MSRP

$275

$1,350

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