This is a perpetual calendar with interchangeable parts. Size: Approximately 31.2 x 60 x 3.5 cm Manufacturer's Suggested Retail Price: ¥8,778 (tax included) Although it is an unused item that has been stored, it has been handled by people, so I have selected "Like new". (Reason for being a defective item) The top board is missing, so please use a substitute. This is the part circled in red in the first photo.