The Porsche Open calendar is 12x17 and comes it its own protective sleeve. It is a
salute to the open top/convertible top and race cars. From the Panamerica, American Roadster, 936 driven by Jackie Ickx, Dan Gurney formula 1 . some pictures over design art drawings? I like the rear cover= art work don't bend= below the car.
the rear page explains the monthly photos, the days are listed in small #s along the side or bottom. The other Bosch vintage is large at 32x18.5 and is of art work of Lucian Bernhard dated back to 1919 in the Bosch company newspaper depicting the artistic design of the original Bosch horn and other items.
Thanks for looking