Which is cheaper, the Borealis Watch Co. Neptuno or the Seiko Prospex Sea 1965 Heritage Diver's Watch?

At MSRP the Borealis Watch Co. Neptuno is the cheaper of the two at $390, against $1,300 for the Seiko Prospex Sea 1965 Heritage Diver's Watch — a $910 gap before any retailer discounting.

Which is bigger, the Borealis Watch Co. Neptuno or the Seiko Prospex Sea 1965 Heritage Diver's Watch?

The Seiko Prospex Sea 1965 Heritage Diver's Watch wears larger at 40mm versus 40.00mm for the Borealis Watch Co. Neptuno — a 0mm difference across the dial.

Which has a longer power reserve, the Borealis Watch Co. Neptuno or the Seiko Prospex Sea 1965 Heritage Diver's Watch?

The Seiko Prospex Sea 1965 Heritage Diver's Watch carries a 72-hour power reserve against 40 hours on the Borealis Watch Co. Neptuno.

What movement does the Borealis Watch Co. Neptuno run compared to the Seiko Prospex Sea 1965 Heritage Diver's Watch?

Both watches run automatic movements — the Borealis Watch Co. Neptuno uses the NH38 and the Seiko Prospex Sea 1965 Heritage Diver's Watch uses the 6R55.

Side by side

Borealis Watch Co. NeptunovsSeiko Prospex Sea 1965 Heritage Diver's Watch

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

Borealis Watch Co.Neptuno

borealis-neptuno-red-fade-to-black-dial-no-date-nh38-automatic-movement-300m-diver-watch

MSRP $390

Seiko Prospex Sea 1965 Heritage Diver's Watch

spb451j1

MSRP $1,300

At a glance

11 of 29 specs differ

Diameter

Neptuno40.00mm

Prospex Sea 1965 Heritage Diver's Watch40mm

Power Reserve

Neptuno40h

Prospex Sea 1965 Heritage Diver's Watch72h

Water Resistance

Neptuno300m

Prospex Sea 1965 Heritage Diver's Watch300m

MSRP

Neptuno$390

Prospex Sea 1965 Heritage Diver's Watch$1,300

Full specifications

Case

4 specs

Diameter

40.00mm

40mm

Thickness

14.10mm

13mm

Lug-to-Lug

47.20mm

46.4mm

Lug Width

20mm

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

NH38

6R55

Power Reserve

40h

72h

Jewels

Pricing

1 specs

MSRP

$390

$1,300

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