I found this inspiring set of vintage calendars over at Grain Edit. For an aesthetic standpoint, my personal favorite is this 1970 Boffi Arredamento Calendar designed by A. Nava & G. Confalonieri. I love the visible grid and the geometric graphic. It’s hard to tell how functional it was.
Nice! 1971 Esso Calendar is my favorite.
Great bit of nostalgia, thanks.