This is a Boston Celtics team issued shirt from 2018-19 NBA Season. It is officially licensed by the NBA and comes with an individually numbered, tamper-evident hologram from Fanatics Authentic and a Certificate of Authenticity from the Boston Celtics. To ensure authenticity, the item can be verified online using the Certificate of Authenticity's unique alpha-numeric code. This process helps to ensure that the product purchased is authentic and eliminates any possibility of duplication or fraud.