Miami Dolphins Helmet Riddell Authentic Full Size Speed Style 1972 T/B Based on one of the most popular on-field designs, this collectible Speed Authentic football helmet is made specifically for fans. At approximately 11 inches tall, this authentic size display helmet is perfect for all football fans and great for autographs. The helmet features a large size Speed shell, the S2BD-SW-SP face mask, a 4-point chinstrap, and official paint and decals specific to the time period. Made by Riddell.