Which is cheaper, the Islander Bayport Automatic Dive Watch with Blue Wave Dial #ISL-311 or the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch?

At MSRP the Islander Bayport Automatic Dive Watch with Blue Wave Dial #ISL-311 is the cheaper of the two at $399, against $2,800 for the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch — a $2,401 gap before any retailer discounting.

Which is bigger, the Islander Bayport Automatic Dive Watch with Blue Wave Dial #ISL-311 or the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch?

The Islander Bayport Automatic Dive Watch with Blue Wave Dial #ISL-311 wears larger at 40mm versus 39.5mm for the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch — a 0.5mm difference across the dial.

What movement does the Islander Bayport Automatic Dive Watch with Blue Wave Dial #ISL-311 run compared to the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch?

Both watches run automatic movements — the Islander Bayport Automatic Dive Watch with Blue Wave Dial #ISL-311 uses the Seiko NH35 and the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch uses the 6L37.

Side by side

Islander Islander Bayport Automatic Dive Watch with Blue Wave Dial #ISL-311vsSeiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch

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

Islander Islander Bayport Automatic Dive Watch with Blue Wave Dial #ISL-311

islander-bayport-automatic-dive-watch-with-blue-wave-dial-isl-311

MSRP $399

Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch

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MSRP $2,800

At a glance

14 of 29 specs differ

Diameter

Islander Bayport Automatic Dive Watch with Blue Wave Dial #ISL-31140mm

Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch39.5mm

Power Reserve

Islander Bayport Automatic Dive Watch with Blue Wave Dial #ISL-311—

Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch45h

Water Resistance

Islander Bayport Automatic Dive Watch with Blue Wave Dial #ISL-311200m

Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch200m

MSRP

Islander Bayport Automatic Dive Watch with Blue Wave Dial #ISL-311$399

Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch$2,800

Full specifications

Case

4 specs

Diameter

40mm

39.5mm

Thickness

13.5mm

12.3mm

Lug-to-Lug

48mm

47.2mm

Finish

—

Brushed and polished

Crystal & Dial

5 specs

Crystal Shape

Flat

Box

AR Coating

Yes

Anti-reflective coating on inner surface

Dial Color

—

Black

Indices

—

Applied

Lume

None

LumiBrite on hands, index(es) and bezel

Movement

4 specs

Caliber

Seiko NH35

6L37

Beat Rate

0 vph

28,800 vph

Power Reserve

45h

Jewels

Pricing

1 specs

MSRP

$399

$2,800

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