The first Mark XVIII model from 2016, IWC reference IW327001, set the standard. Available only in steel, like a true tool watch, the watch was time-and-date only and 40mm in diameter. Importantly, like the original Mark 11 and other watches intended for flight use, it was anti-magnetic. A soft-iron inner case encapsulated the movement and its sapphire glass was secured against drops in pressure.
That model initially was produced in several variations, including with a white dial (IW327002) and with steel bracelets. Two special models also were produced in 2016, including a blue dial Le Petit Prince (IW327004) and a 41mm ceramic/titanium Pilot's Watch Mark XVIII Top Gun Miramar version (IW324702).
After seven references in 2016, the popularity of the Mark XVIII resulted in four additional models in 2017 and more in 2018. Some are rare special editions, such as one only available to active-duty graduates of the US Navy Fighter Weapons School, also known as “Top Gun”.