Mechanical Flip Calendar

Time flies! And with this little device you can fully appreciate it as you turn the manual knobs to adjust the date. One knob changes the month, one changes tens of days and another changes days.

The calendar includes dates for 12 months, 31 days + a simple day of the week indicator. There is no mechanical synchronization between days and months to keep things simple, instead there are three knobs with stepper mechanisms, so you can easily move each counter flap by flap. Comes in a see-through casing, the flaps are just 3 studs thick and built using 4x4 tiles, so numbers can be easily printed or applied using stickers.