Which is bigger, the Aera Instruments M-1 or the William Wood International Association of Fire?

The William Wood International Association of Fire wears larger at 41mm versus 39mm for the Aera Instruments M-1 — a 2mm difference across the dial.

Which has a longer power reserve, the Aera Instruments M-1 or the William Wood International Association of Fire?

The Aera Instruments M-1 carries a 42-hour power reserve against 40 hours on the William Wood International Association of Fire.

What movement does the Aera Instruments M-1 run compared to the William Wood International Association of Fire?

The Aera Instruments M-1 runs a manual caliber (Sellita SW216-1), while the William Wood International Association of Fire runs a automatic (Seiko NH35).

Side by side

Aera Instruments M-1vsWilliam Wood International Association of Fire

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

Aera Instruments M-1

William Wood International Association of Fire

william-wood-iafc

MSRP $820

At a glance

12 of 29 specs differ

Diameter

M-139mm

International Association of Fire41mm

Power Reserve

M-142h

International Association of Fire40h

Water Resistance

M-1100m

International Association of Fire100m

MSRP

M-1—

International Association of Fire$820

Full specifications

Case

5 specs

Crystal & Dial

3 specs

Crystal

Sapphire

Domed Sapphire

Dial Color

Dune

Standard

Lume

Super-LumiNova

None

Movement

3 specs

Caliber

Sellita SW216-1

Seiko NH35

Type

Manual

Automatic

Power Reserve

42h

40h

Pricing

1 specs

MSRP

—

$820

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