Authentic! Please see signature as they are too many to research. All are MLB players past and present. Do not know exactly what year this bat is. The product is a baseball bat autographed by many MLB players past and present, a prominent figure in the fight against prostate cancer. This MLB bat has been used in actual games, making it a unique and special item for baseball fans and collectors alike. The significance of this bat lies not only in its use on the field but also in the personal connection to a cause that affects many people in the baseball community and beyond.