Side by side
Aera Instruments M-1vsTudor Black Bay One 31 S&G
The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.
At a glance
12 of 29 specs differDiameter
M-139mm
Black Bay One 31 S&G31mm
Power Reserve
M-142h
Black Bay One 31 S&G50h
Water Resistance
M-1100m
Black Bay One 31 S&G100m
MSRP
M-1—
Black Bay One 31 S&G$6,850
Full specifications
Case
6 specsDiameter
39mm
31mm
Thickness
13.14mm
9.5mm
Lug-to-Lug
47.6mm
46mm
Lug Width
20mm
17mm
Finish
Brushed and polished
Polished + Satin
Caseback
Solid
Solid screw-down
Crystal & Dial
2 specsDial Color
Dune
Black
Lume
Super-LumiNova
None
Movement
3 specsCaliber
Sellita SW216-1
MT5201
Type
Manual
Automatic
Power Reserve
42h
50h
Pricing
1 specsMSRP
—
$6,850
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