Which is cheaper, the Borealis Watch Co. Caloura 300m or the Seiko Prospex SPEEDTIMER Mechanical Chronograph?

At MSRP the Borealis Watch Co. Caloura 300m is the cheaper of the two at $275, against $2,500 for the Seiko Prospex SPEEDTIMER Mechanical Chronograph — a $2,225 gap before any retailer discounting.

Which is bigger, the Borealis Watch Co. Caloura 300m or the Seiko Prospex SPEEDTIMER Mechanical Chronograph?

The Seiko Prospex SPEEDTIMER Mechanical Chronograph wears larger at 42mm versus 42mm for the Borealis Watch Co. Caloura 300m — a 0mm difference across the dial.

Which has better water resistance, the Borealis Watch Co. Caloura 300m or the Seiko Prospex SPEEDTIMER Mechanical Chronograph?

The Borealis Watch Co. Caloura 300m is rated to 300m versus 10m for the Seiko Prospex SPEEDTIMER Mechanical Chronograph.

Which has a longer power reserve, the Borealis Watch Co. Caloura 300m or the Seiko Prospex SPEEDTIMER Mechanical Chronograph?

The Seiko Prospex SPEEDTIMER Mechanical Chronograph carries a 45-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 SPEEDTIMER Mechanical Chronograph?

Both watches run automatic movements — the Borealis Watch Co. Caloura 300m uses the NH35 and the Seiko Prospex SPEEDTIMER Mechanical Chronograph uses the 8R48.

Side by side

Borealis Watch Co. Caloura 300mvsSeiko Prospex SPEEDTIMER Mechanical Chronograph

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 SPEEDTIMER Mechanical Chronograph

srq047j1

MSRP $2,500

At a glance

13 of 29 specs differ

Diameter

Caloura 300m42mm

Prospex SPEEDTIMER Mechanical Chronograph42mm

Power Reserve

Caloura 300m40h

Prospex SPEEDTIMER Mechanical Chronograph45h

Water Resistance

Caloura 300m300m

Prospex SPEEDTIMER Mechanical Chronograph100m

MSRP

Caloura 300m$275

Prospex SPEEDTIMER Mechanical Chronograph$2,500

Full specifications

Case

6 specs

Crystal & Dial

3 specs

Crystal Shape

Flat

Curved

AR Coating

Inner

Anti-reflective coating on inner surface

Lume

BGW9

LumiBrite on hands and index(es)

Movement

3 specs

Caliber

NH35

8R48

Power Reserve

40h

45h

Jewels

Pricing

1 specs

MSRP

$275

$2,500

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