Which is cheaper, the Aera Instruments C-1 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 $2,200 for the Aera Instruments C-1 — a $850 gap before any retailer discounting.

Which is bigger, the Aera Instruments C-1 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 42mm for the Aera Instruments C-1 — a 0.7mm difference across the dial.

Which has better water resistance, the Aera Instruments C-1 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 is rated to 200m versus 100m for the Aera Instruments C-1.

Which has a longer power reserve, the Aera Instruments C-1 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 56 hours on the Aera Instruments C-1.

What movement does the Aera Instruments C-1 run compared to the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

Both watches run automatic movements — the Aera Instruments C-1 uses the SW510 BH B and the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition uses the 6R35.

Side by side

Aera Instruments C-1vsSeiko 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.

Aera Instruments C-1

MSRP $2,200

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

spb301j1

MSRP $1,350

At a glance

14 of 29 specs differ

Diameter

C-142mm

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

Power Reserve

C-156h

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

Water Resistance

C-1100m

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

MSRP

C-1$2,200

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

Full specifications

Case

6 specs

Crystal & Dial

4 specs

Crystal Shape

Flat

Curved

AR Coating

Inner

Anti-reflective coating on inner surface

Dial Color

Cloud

Black

Lume

None

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

SW510 BH B

6R35

Power Reserve

56h

70h

Jewels

Pricing

1 specs

MSRP

$2,200

$1,350

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