The new Type XXI (21). Features an Automatic Movement with a Flyback Chronograph Function (allows instant restarting of the chronograph with a single push of the button instead of the need to stop & then reset the stop-watch).
This watch also features large minute counter rather than the tradional sub-dial.
In its place (at the 3 o'clock position) is a 24 hour sub-dial to differentiate between AM & PM. 
Luminous Hands & Arabic Numeral Hour Markers.
Date Window Displayed at the 6 o'clock position . 
48 Hour Power Reserve.