Side by side

Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's WatchvsSheffield Deep Gray 300

Q: Which is cheaper, the Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch or the Sheffield Deep Gray 300?

At MSRP the Sheffield Deep Gray 300 is the cheaper of the two at $258, against $3,600 for the Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch — a $3,342 gap before any retailer discounting.

Q: Which is bigger, the Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch or the Sheffield Deep Gray 300?

The Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch wears larger at 42.6mm versus 42mm for the Sheffield Deep Gray 300 — a 0.6mm difference across the dial.

Q: Which has a longer power reserve, the Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch or the Sheffield Deep Gray 300?

The Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch carries a 72-hour power reserve against 40 hours on the Sheffield Deep Gray 300.

Q: What movement does the Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch run compared to the Sheffield Deep Gray 300?

Both watches run automatic movements — the Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch uses the 8L45 and the Sheffield Deep Gray 300 uses the Seiko NH35.

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

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Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch

hbf001j1

MSRP $3,600

Sheffield Deep Gray 300

deep-gray-300

MSRP $258

At a glance

13 of 29 specs differ

Diameter

Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch42.6mm

Deep Gray 30042mm

Power Reserve

Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch72h

Deep Gray 30040h

Water Resistance

Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch300m

Deep Gray 300300m

MSRP

Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch$3,600

Deep Gray 300$258

Full specifications

Case

5 specs

Crystal & Dial

4 specs

Crystal Shape

Curved

Flat

AR Coating

Anti-reflective coating on inner surface

Inner

Dial Color

Black

—

Lume

LumiBrite on hands, index(es) and bezel

None

Movement

3 specs

Caliber

8L45

Seiko NH35

Power Reserve

72h

40h

Jewels

Pricing

1 specs

MSRP

$3,600

—

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Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's WatchvsSheffield Deep Gray 300

At a glance

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