Which is bigger, the Aera Instruments M-1 or the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition?

The Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition wears larger at 44mm versus 39mm for the Aera Instruments M-1 — a 5mm difference across the dial.

Which has better water resistance, the Aera Instruments M-1 or the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition?

The Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition is rated to 200m versus 100m for the Aera Instruments M-1.

Which has a longer power reserve, the Aera Instruments M-1 or the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition?

The Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition carries a 50-hour power reserve against 42 hours on the Aera Instruments M-1.

What movement does the Aera Instruments M-1 run compared to the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition?

The Aera Instruments M-1 runs a manual caliber (Sellita SW216-1), while the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition runs a automatic (8L35).

Side by side

Aera Instruments M-1vsSeiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition

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

Aera Instruments M-1

Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition

sla061j1

MSRP $3,300

At a glance

14 of 29 specs differ

Diameter

M-139mm

Prospex Sea 1970 Heritage Diver's Black Series Limited Edition44mm

Power Reserve

M-142h

Prospex Sea 1970 Heritage Diver's Black Series Limited Edition50h

Water Resistance

M-1100m

Prospex Sea 1970 Heritage Diver's Black Series Limited Edition200m

MSRP

M-1—

Prospex Sea 1970 Heritage Diver's Black Series Limited Edition$3,300

Full specifications

Case

5 specs

Crystal & Dial

4 specs

Crystal Shape

Flat

Curved

AR Coating

Inner

Anti-reflective coating on inner surface

Dial Color

Dune

Black

Lume

Super-LumiNova

LumiBrite on hands, index(es) and bezel

Movement

4 specs

Caliber

Sellita SW216-1

8L35

Type

Manual

Automatic

Power Reserve

42h

50h

Jewels

Pricing

1 specs

MSRP

—

$3,300

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