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Aera Instruments M-1vsSheffield 1A 40mm

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 40mm
Sheffield1A 40mm
MSRP $228
Buy from Aera Instruments ↗
Buy used on eBay ↗
Buy from Sheffield ↗
Buy used on eBay ↗

At a glance

10 of 29 specs differ
Diameter
M-139mm
1A 40mm40mm
Power Reserve
M-142h
1A 40mm40h
Water Resistance
M-1100m
1A 40mm200m
MSRP
M-1—
1A 40mm$228

Full specifications

Case

4 specs
Diameter
39mm
40mm
Thickness
13.14mm
13mm
Lug-to-Lug
47.6mm
48mm
Water Resistance
100m
200m

Crystal & Dial

2 specs
Dial Color
Dune
—
Lume
Super-LumiNova
None

Movement

3 specs
Caliber
Sellita SW216-1
Seiko NH35
Type
Manual
Automatic
Power Reserve
42h
40h

Pricing

1 specs
MSRP
—
$228
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