Which is cheaper, the Serica Ref. 5330 Diving Chronometer Date or the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

At MSRP the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition is the cheaper of the two at $1,350, against $2,005 for the Serica Ref. 5330 Diving Chronometer Date — a $655 gap before any retailer discounting.

Which is bigger, the Serica Ref. 5330 Diving Chronometer Date or the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

The Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition wears larger at 42.7mm versus 39mm for the Serica Ref. 5330 Diving Chronometer Date — a 3.7mm difference across the dial.

Which has better water resistance, the Serica Ref. 5330 Diving Chronometer Date or the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

The Serica Ref. 5330 Diving Chronometer Date is rated to 300m versus 200m for the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition.

Which has a longer power reserve, the Serica Ref. 5330 Diving Chronometer Date or the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

The Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition carries a 70-hour power reserve against 42 hours on the Serica Ref. 5330 Diving Chronometer Date.

What movement does the Serica Ref. 5330 Diving Chronometer Date run compared to the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

Both watches run automatic movements — the Serica Ref. 5330 Diving Chronometer Date uses the SoProd M100 and the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition uses the 6R35.

Side by side

Serica Ref. 5330 Diving Chronometer DatevsSeiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition

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

Serica Ref. 5330 Diving Chronometer Date

5330-chronometre-plongee-date

MSRP $2,005

Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition

spb301j1

MSRP $1,350

At a glance

12 of 29 specs differ

Diameter

Ref. 5330 Diving Chronometer Date39mm

Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition42.7mm

Power Reserve

Ref. 5330 Diving Chronometer Date42h

Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition70h

Water Resistance

Ref. 5330 Diving Chronometer Date300m

Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition200m

MSRP

Ref. 5330 Diving Chronometer Date$2,005

Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition$1,350

Full specifications

Case

4 specs

Diameter

39mm

42.7mm

Thickness

12.2mm

13.2mm

Lug-to-Lug

46.5mm

46.4mm

Water Resistance

300m

200m

Crystal & Dial

3 specs

Crystal Shape

Flat

Curved

AR Coating

Yes

Anti-reflective coating on inner surface

Lume

Super-LumiNova

LumiBrite on hands, index(es) and bezel

Movement

4 specs

Caliber

SoProd M100

6R35

Power Reserve

42h

70h

Jewels

Complications

COSC, Date

None

Pricing

1 specs

MSRP

$2,005

$1,350

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