Side by side

Borealis Watch Co. NeptunovsSeiko Monster

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

Neptuno
Borealis Watch Co.Neptuno
MSRP $390
Monster
SeikoMonster
MSRP $550

At a glance

11 of 29 specs differ
Diameter
Neptuno40.00mm
Monster42.4mm
Power Reserve
Neptuno40h
Monster41h
Water Resistance
Neptuno300m
Monster200m
MSRP
Neptuno$390
Monster$550

Full specifications

Case

5 specs
Diameter
40.00mm
42.4mm
Thickness
14.10mm
13.4mm
Lug-to-Lug
47.20mm
49.4mm
Lug Width
20mm
20mm
Water Resistance
300m
200m

Crystal & Dial

2 specs
Crystal
Sapphire
Hardlex
Lume
BGW9
LumiBrite on hands, index(es) and bezel

Movement

3 specs
Caliber
NH38
4R36
Power Reserve
40h
41h
Jewels
25
24

Pricing

1 specs
MSRP
$390
$550

Follow this matchup

Get a note when Borealis Watch Co. Neptuno vs Seiko Monster gets more votes, a community discussion, or a price drop. No account needed.

Keep exploring

More watches worth a look

Matched to the watches above on size, movement, style and price — microbrands first. Open any one to dig in.

Christopher Ward C60 Lympstone
Christopher Wardmicro

C60 Lympstone

6 watches · 9 variantsC60
40mm·Automatic·600m WR
$1,615MSRP
—Used
Borealis Watch Co. Caloura 300m
Borealis Watch Co.micro

Caloura 300m

4 variantsCaloura 300m
42mm·Automatic·300m WR
$275MSRP
—Used
Borealis Watch Co. Sea Storm MK2
Borealis Watch Co.micro

Sea Storm MK2

Ref. borealis-sea-storm-mk2-random-rob-special-limited-edition
41.50mm·Automatic·300m WR
$475MSRP
—Used
Boldr Charizard
Boldrmicro
Pokémon Collab

Charizard

Ref. charizard
40mm·Automatic·200m WR
$449MSRP
—Used
Spinnaker Hull Commander
Spinnakermicro

Hull Commander

8 watches · 32 variantsHull
42mm·Automatic·300m WR
$520MSRP
—Used
Boldr Marine
Boldrmicro

Marine

2 variantsRef. marine-elewana
40mm·Automatic·200m WR
$439MSRP
—Used
Spinnaker Spence 300
Spinnakermicro

Spence 300

11 variantsSpence
40mm·Automatic·300m WR
$650MSRP
—Used
Marathon OSAR-D (Original SAR with Date) Automatic 41mm
Marathonmicro

OSAR-D (Original SAR with Date) Automatic 41mm

6 watches · 6 variantsOSAR
41mm·Automatic·300m WR
$1,800MSRP
—Used
All alternatives to the Neptuno →All alternatives to the Monster →
Explore the full catalog
Adjacent matchups

People also compared

Comparisons nearby in the catalog — alternatives to the watches above paired against the matchup.

Christopher Ward C60 LympstonevsSeiko MonsterBorealis Watch Co. Sea Storm MK2vsSeiko MonsterBoldr CharizardvsSeiko MonsterBoldr MarinevsSeiko MonsterBorealis Watch Co. Caloura 300mvsBorealis Watch Co. NeptunoBorealis Watch Co. NeptunovsBorealis Watch Co. Jamanta
Edit this comparisonAdd another watchMore diver comparisonsBest Diver Watches Under $500