A classic watch design for enthusiasts: the B-Uhr.  This is a classic navigator's watch, also known as the Type B Flieger.  While acknowledging its origins in the German Luftwaffe that wreaked havoc in WW2, the B-Uhr design has transcended its original context to emerge among the most distinctive and impressive flight watches of the past 100 years.  It is now reproduced by several leading watch companies, including Swatch and IWC.
 
It was designed with an outer ring for minutes/seconds and an inner ring for hours, with easy to read luminescent numbers on a black face.  A large onion-shaped crown was necessary to allow glove-wearing crew to easily adjust their watches. 
 
The Mission 4 watch is known as the "Fortuna," as the caseback is engraved AUDACES FORTUNA IUVAT, Latin for "fortune favors the bold."
 
Each Fortuna comes with a classic black leather pilot strap with a MISSION-engraved buckle.  In the traditional B-Uhr design, there no branding on the watch face - it is pure, clean, and classic.
 
Case dimension: 42.0 mm 316L sand-brushed stainless steel case
Case thickness: 9.42 mm
Overall dimension: 50.0 mm
Case opening: 36.5mm x 36.5mm
Lug width: 22mm
Crown: 7.5mm screw-down crown
Movement: Miyota 2035 Japanese quartz
Accuracy: To within +/- 15 seconds per month
Luminescence: Luminova C3 on the blue-outlined hands and dial
Crystal: Flat sapphire glass
Water resistance: 10 atmospheres / 100 meters