A 1992 Pro Line Portraits dual signed and embossed card featuring Muhammad Ali, also known as Cassius Clay, is a remarkable piece of sports memorabilia. Shows the signature to the front and is signed Cassius Clay across the reverse of the card. With the authenticity certificate. This particular collectible not only serves as a tangible link to Alis iconic persona but also reflects the artistry and attention to detail characteristic of sports memorabilia from the 1990s. Vintage Sport Cards And Portraits For Collectors.