A "perpetual calendar" watch gives the date, day, month while automatically taking the number of days in the month, and the cycle of leap years, into account. It is a masterpiece of architecture and miniaturization. 
You can use this calendar laser cut file for creating a calendar in 2 OPTIONS: standing and hanging.

ABOUT THE FINISHED PRODUCT:
SET of 6
CALENDAR multilayer layout size (finished product): 9 x 9 in.
Number of layers: 4.
Recommended material - Plywood, MDF, Acrylic, Plexiglas, Metal.
The design was made for material thickness 3, 4 and 5 mm (1 / 12in - 1 / 4in).

For your convenience, the downloadable zip folder contains files of different formats such as: .AI, .SVG, .DXF, .DWG, .CDR, .EPS, .PDF and .XCS formats.