Handheld rotating 50-year calendar.
https://diqn32j8nouaz.cloudfront.net...g_calendar.jpg
12-second video:
https://www.youtube.com/watch?v=EVYstj-Lj2E
Previously:
https://www.homemadetools.net/forum/...340#post116509
https://www.homemadetools.net/forum/...713#post102271
https://www.homemadetools.net/forum/...2674#post76760
