Description
Mechanical chronograph movement, stopwatch function with hours, minutes and seconds, hour and minute counters combined in a totalizer at 12 o'clock, flyback function, small hacking seconds, perpetual calendar, large double-digit display for both the date and month, leap year display. Slightly different finish compared to 89801.
All watches using this caliber:

IW3792-01
IWC Ingenieur Perpetual Calendar Digital Date-Month Titanium

IW3792-03
IWC Ingenieur Perpetual Calendar Digital Date-Month Titanium / Red Gold

IW3794-03
IWC Aquatimer Perpetual Calendar Digital Date-Month Edition 50 Years Aquatimer

IW3794-04
IWC Aquatimer Perpetual Calendar Digital Date-Month Titanium / Blue