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

At MSRP the Sheffield Deep Gray 300 is the cheaper of the two at $258, against $2,900 for the Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch — a $2,642 gap before any retailer discounting.

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

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.

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

The Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch carries a 50-hour power reserve against 40 hours on the Sheffield Deep Gray 300.

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

Both watches run automatic movements — the Sheffield Deep Gray 300 uses the Seiko NH35 and the Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch uses the 8L35.

Side by side

Sheffield Deep Gray 300vsSeiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch

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

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Sheffield Deep Gray 300

deep-gray-300

MSRP $258

Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch

sla077j1

MSRP $2,900

At a glance

13 of 29 specs differ

Diameter

Deep Gray 30042mm

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

Power Reserve

Deep Gray 30040h

Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch50h

Water Resistance

Deep Gray 300300m

Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch300m

MSRP

Deep Gray 300$258

Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch$2,900

Full specifications

Case

5 specs

Crystal & Dial

4 specs

Crystal Shape

Flat

Curved

AR Coating

Inner

Anti-reflective coating on inner surface

Dial Color

—

Black

Lume

None

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

Seiko NH35

8L35

Power Reserve

40h

50h

Jewels

Pricing

1 specs

MSRP

—

$2,900

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Sheffield Deep Gray 300vsSeiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch

At a glance

Full specifications

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