This is a Waseda University gakubo (mortarboard). It was purchased approximately 25 years ago. It has never been used and has been stored at home in its original box. I measured the inner circumference of the gakubo, and it was 58cm. Please understand that there may be some error as this was measured by an amateur. A Waseda University tenugui (hand towel) will be included as a bonus. As shown in photo 12, there is a faint line on it. Thank you.