Yoshinobu Yamamoto 2021 NPB Interleague Play MVP Commemorative Autographed Ball - Serial Number Confirmed. I purchased this previously from a website. To confirm that the ball was not swapped, I visited the Mizuno shop in Osaka. The representative there took a photo of the ball on the spot and verified the serial number with the NPB's registry via email and phone. It was explained that the ball and case were manufactured by Mizuno at the request of the team and NPB, and that an NPB representative affixed the registered seal at the Mizuno factory. The representative remembered that the ball already had an autograph at that time and confirmed that it was indeed authentic. Certificates are not currently being issued. I am now listing this set for sale. It will be shipped with the case and outer box, of course. Thank you for your understanding. I will be increasing the price once the WBC begins. I would appreciate your understanding. Unfortunately, I am reluctantly selling this item due to collection consolidation.