From the bike description card:
his is an original, unrestored 1992 Ducati 888 SP4. The "SP" designation signifies "Sport Production," a limited series of race inspired, and race tuned bikes designed to meet racing homologation requirements. The SP4 was reported to make 111 horsepower at 10,500 RPM, and was produced in a limited run of 500 bikes worldwide, none of which were ever designated for US distribution or importation. The SP4 was the only 888 to display the distinctive "#1" insignia on the side panels, commemorating the racing dominance of the Ducati 888 bikes in World competition the prior years. This is one of only two or three known street legal models in the United States, #475/500 as designated by the steering head plaque, and with less than 2300 original Km (not miles). It was aquired from a private collector in 2005 and has been maintained in its pristine and "display-only" condition.