Which is cheaper, the Borealis Watch Co. Caloura 300m or the Seiko Prospex Sea The Black Series?

At MSRP the Borealis Watch Co. Caloura 300m is the cheaper of the two at $275, against $765 for the Seiko Prospex Sea The Black Series — a $490 gap before any retailer discounting.

Which is bigger, the Borealis Watch Co. Caloura 300m or the Seiko Prospex Sea The Black Series?

The Seiko Prospex Sea The Black Series wears larger at 45mm versus 42mm for the Borealis Watch Co. Caloura 300m — a 3mm difference across the dial.

Which has better water resistance, the Borealis Watch Co. Caloura 300m or the Seiko Prospex Sea The Black Series?

The Borealis Watch Co. Caloura 300m is rated to 300m versus 200m for the Seiko Prospex Sea The Black Series.

Which has a longer power reserve, the Borealis Watch Co. Caloura 300m or the Seiko Prospex Sea The Black Series?

The Seiko Prospex Sea The Black Series carries a 41-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 The Black Series?

Both watches run automatic movements — the Borealis Watch Co. Caloura 300m uses the NH35 and the Seiko Prospex Sea The Black Series uses the 4R36.

Side by side

Borealis Watch Co. Caloura 300mvsSeiko Prospex Sea The Black Series

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 The Black Series

srpk43

MSRP $765

At a glance

11 of 29 specs differ

Diameter

Caloura 300m42mm

Prospex Sea The Black Series45mm

Power Reserve

Caloura 300m40h

Prospex Sea The Black Series41h

Water Resistance

Caloura 300m300m

Prospex Sea The Black Series200m

MSRP

Caloura 300m$275

Prospex Sea The Black Series$765

Full specifications

Case

5 specs

Diameter

42mm

45mm

Thickness

13.9mm

13.2mm

Lug-to-Lug

44.20mm

47.7mm

Lug Width

22mm

Water Resistance

300m

200m

Crystal & Dial

2 specs

AR Coating

Inner

Anti-reflective coating on inner surface

Lume

BGW9

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

NH35

4R36

Power Reserve

40h

41h

Jewels

Pricing

1 specs

MSRP

$275

$765

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