Which is cheaper, the Borealis Watch Co. Caloura 300m or the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition?

At MSRP the Borealis Watch Co. Caloura 300m is the cheaper of the two at $275, against $3,300 for the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition — a $3,025 gap before any retailer discounting.

Which is bigger, the Borealis Watch Co. Caloura 300m or the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition?

The Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition wears larger at 44mm versus 42mm for the Borealis Watch Co. Caloura 300m — a 2mm difference across the dial.

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

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

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

The Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition carries a 50-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 Black Series Limited Edition?

Both watches run automatic movements — the Borealis Watch Co. Caloura 300m uses the NH35 and the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition uses the 8L35.

Side by side

Borealis Watch Co. Caloura 300mvsSeiko Prospex Sea 1970 Heritage Diver's Black Series Limited 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 Black Series Limited Edition

sla061j1

MSRP $3,300

At a glance

12 of 29 specs differ

Diameter

Caloura 300m42mm

Prospex Sea 1970 Heritage Diver's Black Series Limited Edition44mm

Power Reserve

Caloura 300m40h

Prospex Sea 1970 Heritage Diver's Black Series Limited Edition50h

Water Resistance

Caloura 300m300m

Prospex Sea 1970 Heritage Diver's Black Series Limited Edition200m

MSRP

Caloura 300m$275

Prospex Sea 1970 Heritage Diver's Black Series Limited Edition$3,300

Full specifications

Case

5 specs

Diameter

42mm

44mm

Thickness

13.9mm

13mm

Lug-to-Lug

44.20mm

49.3mm

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

8L35

Power Reserve

40h

50h

Jewels

Pricing

1 specs

MSRP

$275

$3,300

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