MoDiP has several other examples of perpetual calendars adopting either a system of dials to rotate the correct day/month into a viewing window or including a selection of different sized cards, printed with the relevant information. The first method can be fiddly to operate (some of the mechanics are quite small and stiff) whilst the second is challenging if the individual cards get muddled or lost. Mari’s design combines elements of both methods and in so doing, ends up being far more functional.
designed in 1967, it was released by Danese that same year and is still in
production today, available
in Italian, English, French and German language versions.
to have been inspired by railway signs, it uses the Helvetica sans-serif
typeface on a series of lithographed polyvinyl chloride
cards representing each day, week and month. These are fixed to a central point
so that they can be easily flipped into place as appropriate (see image below).