The Original Judy Clock is still a favorite of students and teachers. The Judy Clock makes learning to tell time simple and fun for children. Visible functioning gears maintain correct hour-hand and minute-hand relationships. Easy-to-read numerals show elapsed time in five-minute intervals. Features a classic yellow design with visible green and red working gears. Just turn the large knob on the back of the clock and watch the gears at work, moving the big red hands on the clock face. The permanently assembled wood clock is 12-3/4 x 13-1/2". Handy metal stand and teaching guide are included. Grades K-3.