Yoshinobu Yamamoto 2021 NPB Interleague MVP Commemorative Autographed Baseball. Serial number confirmed. I purchased this previously on a website. To verify the authenticity and prevent any swapping of balls, I visited a Mizuno shop in Osaka. The staff there photographed the ball on the spot and confirmed the serial number against the NPB's management ledger. They also verified it via email and phone. I was told that the ball and case were manufactured by Mizuno at the request of the team and NPB, and that an NPB representative had affixed a registered seal at the Mizuno factory. They even remembered that the ball had a signature on it at the time, and confirmed that it was genuine. Apparently, certificates of authenticity are not currently being issued. I am now offering this set for sale again. Of course, it will be shipped with the case and outer box. Thank you. The price will be increased once the WBC begins. I appreciate your understanding. Unfortunately, I am reluctantly selling this due to collection reorganization.