Fabulous C. 1820s Century Mechanical Ink and Watercolor Perpetual Almanack, Ready to UseSo cool, and so crisp and modern feeling, though about 200 years old! It is a working perpetual calendar, ink and watercolor on card, with a tab on the back side that moves up and down to change the day of the week, making it ever applicable. With the days of the month arranged in a neat grid at center, and the hand written text on the column at right noting the number of days in each month. ("Feb. hath 28 or 29 days") A bit akin to a mechanical