This is a Hakone Yosegi-zaiku secret box. The size is approximately 11.5 x 8 x 5.5 cm, and based on what I've seen online, it appears to be a 7-step opening mechanism. It was given as a gift and has been on display. The outer box and the instructions for opening it are missing, so the opening method is unknown. The exterior is in good condition, with no noticeable scratches or stains. Please be aware that this is a used item that has been stored at home for a long time, so there may be some age-related deterioration and signs of use. Thank you for looking.