Schedule wheel - photo and video

[Toolmaker51]

The cardboard date 'tool' is likely a 'Perrygraf'. That company designs and manufacturing produced a wide array of such slide rules for a large variety of industries and applications. As such, they are not only handy and dependable for estimating, there's a brisk trade among collectors.
I'm afraid many wind up mere fidget toys in some twits mancave.