February is that one occasion in the year when perpetual calendar owners get to show off where all that extra cash went.

While possessors of all other date and calendar watches, even annual calendars, are poking recessed buttons or fiddling with crown positions, the wearer of a perpetual calendar could host an end-of-month midnight salon to allow friends to witness the effortless mechanical transition between February and March.

(Admittedly, he would first need to find friends to invite to said soiree.)

Complex and cleverly programmed the perpetual may be, but their dials have to offer up a vast array of information which can make legibility a challenge.

How do five of the latest releases manage this task?