Saving the date with a perpetual calendar you save paper, trees, the planet and your money. Not bad.
1 | Imbroglio designed by Jean Pierre Vitrac in 1973 for Piranha;
2 | Max 365 designed by Massimo Vignelli in 1979 for Nava, Milano;
3 | Vintage perpetual calendar from 60s;
4 | Formosa designed by Enzo Mari in 1963 for Danese, Milano.