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Aera Instruments M-1vsSheffield 1A

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

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M-1
Aera InstrumentsM-1
1A
Sheffield1A
MSRP $223
Buy from Aera Instruments ↗
Buy used on eBay ↗
Buy from Sheffield ↗
Buy used on eBay ↗

At a glance

11 of 29 specs differ
Diameter
M-139mm
1A40mm
Power Reserve
M-142h
1A—
Water Resistance
M-1100m
1A200m
MSRP
M-1—
1A$223

Full specifications

Case

5 specs
Category
—
Diver
Diameter
39mm
40mm
Thickness
13.14mm
12.8mm
Lug-to-Lug
47.6mm
46mm
Water Resistance
100m
200m

Crystal & Dial

2 specs
Dial Color
Dune
White/Blue
Lume
Super-LumiNova
Swiss blue lume

Movement

3 specs
Caliber
Sellita SW216-1
Seiko NH35A
Type
Manual
Automatic
Power Reserve
42h
—

Pricing

1 specs
MSRP
—
$223
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