This is an excellent find, and a very rare one, at that. This is the Toei Animation 1968 calendar. Needless to say, finding one of these vintage calendars would make your name as a collector and Ghibli Freak. You'd probably get a free tour through the Pixar campus for this. Heh, heh.
These illustrations are from Toei's 1967 feature film, Jack and the Witch. According to Ben Ettinger's Anipages....here, why don't I just post his paragraph and get out of the way:
If this section 2 production comes across as decidedly lacking in the animation department, it's because most of the important animators were busy at work on Horus, on which production had been progressing since October 1965, when the project was given the green light. The strain of the two-section production system begins to become evident. In fact, I'd say this is the worst animated of the classic Toei Doga films. But it is a fairly good film, in its own unique way. Despite the uncharacteristically stodgy animation, we have here a film with interesting character designs, good music, a fun story, but most of all very daring abstract background art by Reiji Koyama, the famous modern art painter hired here for another stint as the art director after the excellent work he did for Little Prince. The animation, full of strangely cartoonish touches like the undulating car, is quite unique for a Toei Doga film, and does have a certain appeal, though it feels like a failed experiment more than anything.